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Hello my game bugged. Im currently at pokekon league but everytime I talk to the 1st elite 4 my game crashes and I can no longer proceed :(
*Update
Managed to fix it. I tried fighting a wild pokemon and for some reason its shiny even tho I didnt get stardust. When I went to elite 4 again the crash didnt happen.
Side question. What's the difference between the choices after beating elite 4?
Another update: im currently at the mystery town. Where you create time paradox with jirachi, however I cant advance futher since the last puzzle is very hard (the one with mew in truck) how to finish it? I already got missingno. I also tried whiting out and it brings me to poke center. Is that the the way? Or ia there a proper way of finishing the puzzle?
so does deciding to not use the time machine after you become champion have any benefit? so far it didn't give me a hall of fame, and the portals around the world are still unusuable. both of these things work properly if i use the time machine
It's been nearly a year since the version 1.1.4 release! I took a long break from this hack and have been wanting to get back to fix up a few bugs here and there. Naturally, I got distracted and ended up adding a ton of new things. But I hope you guys will appreciate the changes. Many thanks to everyone who gave feedback on earlier versions of the hack, I appreciate your time and effort playing!
So, what's new in 2.0.X?
Short version:
Spoiler:
Revamped the game's story
Revamped all four world maps
Added functional Pokédex map
Added several new maps, including Underground areas and areas accessible through Time Travel
Added static encounters for every available legendary
Added post-game content, including EV training, rebattleable bosses, and a special post-game paradox event
Revamped/added several moves, including move animations
Revamped version exclusive content, including title screen and rival battles
Added proper Pokédex entries for missing Pokémon
Added several quality of life updates
Several bug and text fixes
Long version (Potential Spoiler Warning):
Spoiler:
New Content
Added functional Pokedex maps for Manta region
Revamped Town/Fly Map to show more detail in Manta region & Sevii Island replacements
Added Underground maps that connect existing maps & add additional content below Tierra Town, Estrella Island, Andromeda City
Added portals that access new content, mostly post-game
Moves now show icons for the Physical-Special Split
Pokemon gain EXP from catching wild Pokemon
Natures are now colored
Added an EV and IV display screen
Added NPCs that increase a Pokemon's IVs if given a Bottle Cap
Added several stat boosting items, including two Eevee-specific items and several items held by legendaries
Added future and past versions of maps, accessible through portals
Added three Mt. Ande maps for fossils and rare spawns
Revamped Genesis Island event for Mew
Revamped Kronos Island event for Celebi
Replaced Space Chamber event from Mt. Mythos to Crater City portal for Deoxys
Added Underground portals for Raikou, Suicune, Regirock, Registeel
Added Triunfo Road portal for Entei
Added Zero Kelvin Way portal for Regice
Added Darwin Shoal portal for Latias
Added Quasar Cavern portal for Latios
Added Omega Oasis portal for Groudon
Added Alpha Abyss portal for Kyogre
Added Delta Beach portal for Rayquaza
Added Starfall City portal for Jirachi
Added special paradox event at Starfall City
Cutting down the tree after both restoring the timeline and battling Jirachi creates paradox
Fixing the paradox involves traversing through several mazes in the Mystery Zone, inspired by Yume Nikki
Story changes:
Important character's text are now color-coded to determine who is talking
Intro is shorter, no longer a wall of text
Celebi ghost replaces professor in intro
Player starts in bed
Marowak boss fight at Machu Pichu changed
Rival text much shorter at Machu Pichu and Silph CO.
Story exposition more spread out amongst NPCs at Silph CO. and Machu Pichu
Stardust Bridge text changed
Endings aren't huge walls of text anymore
Second ending has a better animation
Palm gives out second quest information at lab rather than at ending
Move changes:
Updated move power, PP, accuracy, priority, and most names and effects to match modern games
HMs are now deletable
TMs in shop can only be bought one at a time
Replaced Shock Wave with Discharge, Skill Swap with Nasty Plot, Razor Shell with Aqua Tail, Frustration with PowerUpPunch, Mega Punch with Avalanche
Revamped the entire TM and Move Tutor compatibility
Revamped egg moves
Revamped learnable TM list, replacing:
TM02 Dragon Claw with Dragon Pulse
TM03 Water Pulse with Scald
TM05 Roar with Shadow Claw
TM07 Hail with Avalanche
TM09 Bullet Seed with Energy Ball
TM11 Sunny Day with Wild Charge
TM18 Rain Dance with Aqua Tail
TM21 Frustration with Dark Pulse
TM22 SolarBeam with Focus Blast
TM23 Iron Tail with Iron Head
TM31 Brick Break with PowerUpPunch
TM34 Shock Wave with Discharge
TM37 Sandstorm with Night Slash
TM39 Rock Tomb with Stone Edge
TM41 Bullet Punch with Poison Jab
TM42 Facade with Earth Power
TM43 Secret Power with X-Scissor
TM47 Steel Wing with Flash Cannon
TM48 Skill Swap with Signal Beam
TM49 Bug Buzz with Nasty Plot
TM50 Overheat with Swords Dance
Shifted locations of TMs throughout region:
TM07 Avalanche -> Icicle Isles
TM21 Night Slash -> Tactix Hideout
TM26 Earthquake -> Triunfo Road
TM37 Dark Pulse -> Starfall Gym
TM40 Air Slash -> Magellanic Stream
Buyable TMs now include:
TM05 Shadow Claw
TM15 Hyper Beam
TM20 Giga Impact
TM31 Drain Punch
TM43 X-Scissor
TM44 Rest
TMs available at Crater Dept. Store Rooftop:
TM16 Light Screen
TM33 Reflect
TM45 Attract
Revamped learnable Move Tutor moves, replacing:
Mega Punch with False Swipe
Seismic Toss with Sandstorm
Mega Kick with Hail
Explosion with Sunny Day
Softboiled with Rain Dance
Swords Dance with SolarBeam
Metronome with Weather Ball
Double Edge with Hyper Voice
Dream Eater with Zen Headbutt
Revamped several learnsets, most notably:
Added Frenzy Plant, Blast Burn, and Hydro Cannon into every starter's learnsets
Eevee + Evolutions learn moves at the same levels
Regirock, Regice, and Registeel don't explode at level 1
Raikou and Entei no longer Roar themselves out of existence
Pokémon affected by TM/Move Tutor move changes get those moves added to their learnsets
Added custom animations to several moves, courtesy of:
dreamengine - Ominous Wind, Aura Sphere, Focus Blast, Giga Impact, Iron Head, Poison Jab, Power Gem, Roost, X-Scissor, Wild Charge, Air Slash, Aqua Jet, Bullet Punch, Power Whip
MrDollSteak - Scald, Drain Punch, Dark Pulse, Energy Ball, Dragon Pulse, Brave Bird, Ice Shard, Stone Edge, Shadow Claw, Shadow Sneak, Aqua Tail, Nasty Plot, Avalanche
DoesntKnowHowToPlay - Roar of Time, Earth Power, Bug Buzz, Discharge
Gave both variations of Mew and Celebi sprites back and side sprites
Swapped Jessica's overworld sprites with Lechuga's overworld sprites
Bug Fixes:
Fixed bug in Machu Pichu where Rival wouldn't talk
Fixed bug where Pokémon with no dex entries would crash the game
Fixed bug where game would crash if the player obtained two Stardusts in a row
Fixed bug where catching a scripted Shiny Pokémon meant for a trainer would result in a bad egg
Fixed bug in Crater City Department Store where Sol Island would show up on the header
Fixed Rock Smashable rocks in the Laniakea Tunnel
Fly to Tierra Town no flies player to front of house
Fixed Mew and Celebi's overworld sprites immediately disappearing after battle
Fixed buggy cries
Fixed Rhyperior's typing from Rock/Ground to Ground/Rock
Fixed Probopass' typing from Normal to Rock/Steel
Fixed typing issue with Fairy types (ex. Changed Gardevoir from Fairy/Psychic to Psychic/Fairy)
TMs now show the right color and description
Rival's chibi sprite now shows the right color in the intro
Scooter now mountable/dismountable in Laniakean Lines
Fixed bug where Sevii Island maps would show up in certain Manta maps
Fixed bug where Tactix Grunts in Mt. Helios would say first password too early
Fixed bug where trainer in Triunfo Road wouldn't speak after battle
Made MISSINGNO. catchable & fixed up its TM/HM learnset
Fixed bug where fainting at Elite Four wouldn't send you back to the Pokémon League building
Fixed Nidoran M's sprite
Fixed Peaxie's sprite
Fixed Female Protagonist's trainer card sprite
Fixed Mew's encounter in the female timeline from not showing up as Shiny
Several map fixes, including buggy movement permissions and misplaced tiles
Several text fixes, including typos and cut off words
Changes added as of 2.0.2
Spoiler:
Ditto breeding mechanic was fixed by swapping Ditto with Mr. Mime *
Root and Claw Fossils now have special text at Estrella Island Lab
Nova City's Pokémart sells more items
Andromeda City's Pokémart now sells Potions
Tile fixes at Port Aurora
*if you're using an old save, your Mr. Mimes will turn into Dittos and vice-versa
Older Update Notes
Spoiler:
Version 2.0.1: (4/9/2021)
(see above)
Version 2.0.0: (3/11/2020)
Added functional Pokédex maps for Manta region
Added new maps, including Underground areas and areas accessible through Time Travel
Revamped several old maps
Added static encounters for every available legendary
Added a special post-game paradox event, inspired by Yume Nikki
Revamped TMs/HMs, Move Tutors, and egg moves
Revamped learnsets
New moves added, including Discharge, Roar of Time, PowerUpPunch, Aqua Tail, Nasty Plot, Avalanche
Moves not native to FireRed now have custom battle animations
Fixed a bug where Dr. Fuji and your rival wouldn't talk to you at Machu Pichu
Fixed more game-crashing Rock Smash-able rocks in the Laniakea Tunnel
Team Tactix focuses on double battles
Revamped the cinematic at the ending credits
Trainers in Floot Island now rebattlable
Weather-based moves teachable by Move Tutors, who will challenge you in the post-game
Updated teams for rival and Elite Four members
Text speed set to Fast, sound set to stereo, and frame set depending on version by default
Exp is gained even after catching something
Repels now ask if you want to use another if they run out
Magma Armor and Flame Body speed up egg hatching
Natures are now color-coded
Physical, special, and status icons now viewable on the move screen
Updated teams for rival and Elite Four members
Kecleon has a new shiny, based off Mystery Dungeon's Kecleon
Revamped wild spawns
Revamped intro sequence
Text fixes, and other quality of life changes
Version 1.1.4: (4/22/2020)
Updated Elite Four/Champion movesets
Trainers on Floot Island no longer use Revives
Replaced TM01 Focus Punch with TM01 Dazzle Gleam
Fairy Gym no longer gives out Toxic, but rather Dazzle Gleam
Toxic found where Focus Punch used to be (Silph Co Floor 5)
Updated Pokémon learnsets to be compatible with TM01 Dazzle Gleam
Updated Pokémon learnsets to be compatible with additional moves
Fixed item balls spawning infinite items in Triunfo Road
Removed Dialga from Habitats list to prevent crashing
Fixed Stardust ball found at Mt. Ande exit
Text Fixes
Version 1.1.3: (3/18/2020)
Updated sprite for Dolphry M
Updated sprite for Dolphry F
Updated sprite for Triphin
Updated sprite for Narwish
Text Fixes
Version 1.1.2: (1/5/2020)
Updated sprite for Tortot
Updated sprite for Peaxie
Edited Pokédex Habitat Page
Pokédex entries beyond Deoxys accessible through Habitat Page
Fixed boat animation on Estrella Island
Text Fixes
Version 1.1.1: (1/5/2020)
Fixed bug from 1.1.0 changes that made Pokémon caught by Stardust into Bad Eggs.
(This means the game is back to freezing if you grab two consecutive item balls containing Stardust)
Version 1.1.0: (1/2/2020)
Game balance changes (Earlier areas nerfed, later areas slightly buffed)
Pokémon that evolve via happiness now have an additional set level at which they'll evolve at
Roadblock in Crater City added to keep player on track
Added hints to locations where players tend to get stuck at (Stellar City gate, Port Aurora, Void Island)
Fixed Safari Ball price
Fixed Water Pulse strength from 80 to 60
Fixed bug that allowed player to fly directly to the Pokémon League early
Fixed certain tiles and movement permission bugs
---------POTENTIAL SPOILERS BELOW-------------------
Fixed bug where grabbing two consecutive item balls with Stardust would freeze the game
Added warps to Genesis Island and Kronos Island within secret chamber in Eievui Ruins
Added additional shiny trainer battles (Tactix Hideout, Silph CO)
Mr. Mime and Farfetch'd trades now shiny
Added revivable fossils as a rare spawn (Floot Island)
Version 1.0.5: (12/18/2019)
Fixed Rock Smash from not smashing rocks in overworld.
Replaced starter Eevee's Lucky Egg with an Exp. Share
Replaced gift Feebas' Amulet Coin with a Soothe Bell
Replaced gift Eevee's Exp. Share with a Lucky Egg
(Amulet Coin is still obtainable later on)
Fixed inconsistency with rival battle on Titanic II in Amethyst, Onyx, and Opal versions
Swapped stone locations in Mt. Ande to get box art eevee evolutions earlier
Added new event legendary encounter
Fixed some text issues
Version 1.0.4:(11/29/2019)
Added another fix for Pokédex (just outside north exit of Lost Woods, south of Andromeda City)
Fixed physical/special split for some moves (rock throw, gust, poison gas)
Version 1.0.3:(11/13/2019)
400th obtainable Pokémon added
(try looking around the bottom floor of Machu Pichu for it!)
New abilities given to most Pokémon with 1 ability, mostly hidden abilities
Late-game gym leaders buffed by around 3 levels
Added script to prevent player from not obtaining the Pokédex before leaving Nova City
Fixed a few minor bugs
Version 1.0.2:(11/6/2019)
Gamebreaking bug in Triunfo Road actually fixed (for good this time)
Fixed bug with Map on 4-7 Islands
Added an updated sprite for Elite Four Ashley
Fixed a few text errors and typos
Fixed bug that causes Nurse Joy to crash the game at the Elite Four
Version 1.0.1:(11/5/2019)
Gamebreaking bug in Triunfo Road Fixed
Fixed Triunfo Road Trainers
Bug with Rock Smash Fixed
Bug with not obtaining national dex fixed (Talk to Ace Trainer at Andromeda City if you can't evolve non-Kanto Pokémon for a quick fix)
Fixed some tiles
Added some flair to maps (in progress)
Rom Base: FireRed [BPRE] Version 1.0
Language: English
Creator: AquamarineVaporeon/Vaporeon22
Intro:
Pokémon Aquamarine is a ROM hack of FireRed that takes place in Manta, an entirely new region based off South America. The player character mysteriously turns into a Mew, and takes on a journey as a Pokémon trainer to figure out how to turn back to human. Aquamarine has been in development since 2014, and was fully released in Version 1.0.0 as of October 2019. Currently, the ROM hack is fully playable as of Beta version 2.0.2. If anyone happens to find any bugs, please let me know!
Pokémon Aquamarine also comes in different colors!
Pokémon Aquamarine is one out of nine variants of the same game, each corresponding with Eevee or one of its evolutions. There aren't many major differences between the variations, but the title screens are different, and the team your rival uses changes depending on the version. If you're unsure of which to play, I suggest going with your favorite!
These variations include: Opal- Eevee Aquamarine- Vaporeon Topaz- Jolteon Garnet- Flareon Amethyst- Espeon Onyx- Umbreon Turquoise- Leafeon Quartz- Glaceon Zircon- Sylveon
If you're curious about what differences it makes to the Rival's team...
Spoiler:
The Eevee your rival decides on depends on the intro text of the Eevee you decide on.
(For example, if you choose the Eevee that likes to watch the rain, your rival chooses the energetic one that later evolves into Jolteon)
Aquamarine/Topaz/Garnet: Rival's team contains either Vaporeon, Jolteon, or Flareon
Amethyst/Onyx/Zircon: Rival's team contains either Espeon, Umbreon, or Sylveon
Opal/Turquoise/Quartz: Rival's team contains either Eevee, Leafeon, or Glaceon
Story/Themes:
Pokémon Aquamarine opens with the player character having a strange dream. A ghostly figure named Ilex claims that the player has turned into a Mew, and must embark on a journey to return to their human body.
The plotline of the game diverges whether the player chooses to play as a boy or a girl. As a boy, the player turns into a regular Mew. As a girl, the player turns into a Shiny Mew.
The following spoiler contains lore for the male plotline:
Spoiler:
In this timeline, Team Tactix obtains a sample of Mew's DNA. They reverse-engineer this DNA and are able to synthesize whatever Pokémon they desire in the future. This sudden influx of genetically engineered Pokémon causes the future's ecosystem to collapse, so that timeline's Celebi goes back in time to prevent Team Tactix from creating that future. In the process of genetic experimentation with Mew's DNA, Team Tactix manages to synthesize a Shiny Mew.
The following spoiler contains lore for the female plotline:
Spoiler:
In this timeline, the leader of Team Tactix captures a Shiny Celebi in the past, which gives him an obsession with Shiny Pokémon. When the player shows up, the Team Tactix leader is determined to capture this Shiny Mew that appeared out of nowhere, but fails and only manages to obtain a DNA sample. He tries to reverse-engineer the DNA sample, but is unable to synthesize a clone out of it. Instead, he uses Mew's DNA to figure out when Mew lives on Earth, and uses Shiny Celebi to travel back in time and capture Mew.
Aquamarine incorporates a lot of themes from both science and science fiction, including:
Articuno - Static encounter inside Icicle Islands, wild encounter inside Icicle Islands
Zapdos - Static encounter inside Power Plant, wild encounter inside Power Plant
Moltres - Static encounter at Mt. Helios, wild encounter at Mt. Helios
Mewtwo - Static encounter inside Solstice Cave after clearing postgame
Mew - Static encounter at Genesis Island, wild encounter at Genesis Island (requires beating elite four twice and getting good ending)
Raikou - Static encounter at Mare Island Underground, wild encounter inside Power Plant, Roaming depending on starter
Entei - Static encounter at Triunfo Road, wild encounter at Mt. Helios, Roaming depending on starter
Suicune - Static encounter at Estrella Island Underground, wild encounter inside Icicle Islands, Roaming depending on starter
Ho-Oh - Static encounter inside Mt. Mythos after clearing postgame
Lugia - Static encounter inside Mt. Mythos after clearing postgame
Celebi - Static encounter at Kronos Island, wild encounter at Kronos Island (requires beating elite four twice and getting good ending)
Regirock - Static encounter at Tierra Town Underground, wild encounter at Tierra Town Underground
Regice - Static encounter at Zero Kelvin Way, wild encounter at Estrella Island Underground
Registeel - Static encounter at Andromeda City Underground, wild encounter at Andromeda City Underground
Latias - Static encounter at Darwin Shoal, wild encounter inside Triunfo Road
Latios - Static encounter at Quasar Cavern, wild encounter inside Triunfo Road
Kyogre - Static encounter at Alpha Abyss, wild encounter at Alpha Abyss
Groudon - Static encounter at Omega Oasis, wild encounter at Omega Oasis
Rayquaza - Static encounter at Delta Beach, wild encounter at Quasar Cavern
Jirachi - Static encounter at Starfall City, wild encounter inside Solstice Cave
Deoxys - Static encounter near Crater City after clearing postgame
Dialga - Static encounter at Eievui Chambers (requires beating elite four twice and getting good ending)
Special Pokémon:
OMANYTE - Revived from Helix Fossil obtained at Nova City, hatched from OMANYTE or OMASTAR egg
OMASTAR - Evolve OMANYTE
KABUTOPS - Revived from Dome Fossil obtained at Mt. Ande, wild encounter at Floot Island
AERODACTYL - Revived from Old Amber obtained at Mt. Ande, wild encounter at Floot Island
Ghost - Wild encounter at bottom floor of Machu Pichu
MISSINGNO. - Wild encounter at Mystery Zone, or by surfing at Estrella Island
Trainer Tips: An easy way to find these is by using Repels on lower-leveled Pokémon
Credits:
Art:
Spoiler:
Gen 6/7 Sprites- Layell (X/Y Sprite Project, Sun/Moon Sprite Project)
Gen 4/5 Sprites- Pokémon Diamond/Pearl/Platinum & Black/White
Hummling/Fairikeet/Peaxie- Shiny_Vaporeon/Vaporeon22
Dolphry- The_ShinyMew/The_ShinyMew_2015 (iFunny)
Narwish- SurfingRaichu/SpookyWorld (iFunny)
Triphin- MegaStarizard/Vesper09 (iFunny)
Tortot/Tortundra- Rybread52 (iFunny)
Tortide/Tortress/Tortremor/Tortasty- MegaStarizard/Vesper09 (iFunny)
Tortalus- Aka_Kun/Kazeun (iFunny)
Music help from UmbreonGurl/Umbreon (iFunny)
dreamengine- Ominous Wind, Aura Sphere, Focus Blast, Giga Impact, Iron Head, Poison Jab, Power Gem, Roost, X-Scissor, Wild Charge, Air Slash, Aqua Jet, Bullet Punch, Power Whip
MrDollSteak- Scald, Drain Punch, Dark Pulse, Energy Ball, Dragon Pulse, Brave Bird, Ice Shard, Stone Edge, Shadow Claw, Shadow Sneak, Aqua Tail, Nasty Plot, Avalanche
DoesntKnowHowToPlay- Roar of Time, Earth Power, Bug Buzz, Discharge
Shadowraze- Zen Headbutt
Spherical Ice- Moonblast
Chaos Rush- Night Slash
Garuga17- Flash Cannon
pawell6- Stone Edge (Rock Wrecker's Animation)
BadgerLordZeus- Power-Up Punch
Vaporeon22- Draining Kiss, Play Rough, Dazzling Gleam, Boomburst, Flare Blitz, Razor Shell, Inferno, Horn Leech
Battle Mechanics Credits:
Spoiler:
Manekimoney and DarkCyborg- Effort Value vitamins no longer cap at 100, but rather 252
Touched- Limit for effort values changed to 252 from 255
Delta231- Updated to Gen VII paralysis and burn mechanics
blackuser- Updated Volt Absorb to absorb Thunder Wave
HidoranBlaze- Updated Rough Skin to Gen IV mechanics
MrDollSteak and Umbrelava- Updated Sturdy to Gen V mechanics
Chacha Dinosaur- Updated Spite, Protect/Detect, and Blizzard now doesn't miss in a Hailstorm
kleenexfeu and MrDollSteak- Updated binding moves
DoesntKnowHowToPlay- Updated Disable, Enctore, and Taunt
Zeturic- Hidden Power now has a set power of 60 and shows what type it is
chainfire57- Snow Warning replaces Cacaphony as an ability
Miscellaneous Credits:
Spoiler:
HackMew- For creating several easy to use hacking tool, as well as the Magma Armor ASM routine and roaming pokemon bug fix
DoesntKnowHowToPlay- For the creation of several useful patches, including the Physical/Special split and showing stats in the dex. Additionally, changing the items available through Pickup
JPAN- For adding several special routines thanks to their hacked engine
jiangzhengwenjz, Li Yun and Dreamaker- For their routine that adds in an EV and IV display screen
The_Learner- For their Quick Enhancer tool that helps display physical/special icons, color natures, and gain EXP from catching Pokemon
FBI- For their infinite TM usage routine
Darthatron- For their B2/W2 Repel ASM routine
Skeli and MWisBest- For making eggs easier to hatch in general
Skeli- For making in-shop TMs being purchasable one at a time
Super Versekr Dark- For making Choice Scarf & Choice Specs
Spherical Ice- For making sideways stairs, EV reducing berries, Ability Capsules, and PC boxes being able to use more wallpapers
Dreamaker- For making Selphy only give out Rare Candies
Jambo51- For making eggs hatch at level 1
kikiyama- Developer of Yume Nikki, which the paradox event takes inspiration from
so does deciding to not use the time machine after you become champion have any benefit? so far it didn't give me a hall of fame, and the portals around the world are still unusuable. both of these things work properly if i use the time machine
Doesn't really have one, but I can design one real quick: Think of a T, but intertwining like DNA. Red and blue of course. If you're still doing a comic, I'd love to see it!
Hi, there's a way that we can know what is the chance of every legendary appear in the wild, or their levels? I've been trying to find the MissingNo in the Estrella Island for hours surfing, using sweet scent and nothing...
I set all the wild legendaries and other special encounters at a higher level than the wild encounters. If you have a repel and a pokemon at a higher level than the wild pokemon, you should be able to find those pretty easily. MissingNo itself is much more common in the Mystery Zone if you've unlocked that area.
so does deciding to not use the time machine after you become champion have any benefit? so far it didn't give me a hall of fame, and the portals around the world are still unusuable. both of these things work properly if i use the time machine
Being able to use the time machine or not is mostly story-based. Mechanically, it allows people who can't save the game to keep playing after beating the elite four since it doesn't force the save and restart their game. This comes at the cost of not having the hall of fame data, but it is purely your own choice.
Here are the story-based reasons:
Spoiler:
Whenever you use the time machine, you return to your own human body as seen by the cutscene after the hall of fame entry.
The first time, your decision doesn't really matter. If you choose "No", you get warped back home. If you choose "Yes", you enter the hall of fame and the game ends. If you boot the game back up, there is special dialogue that explains that the timeline split and you fainted before activating the time machine.
The second time decision is more important. Yes, the portals get fixed regardless of your decision. This is intended. If you decide to not use the time machine and continue playing as a Mew, you receive tickets to two areas where you can catch Celebi and Mew.
