I think the answer should be "every single legendary in existence".
This.
Basically,
every single Pokemon on this list, but primarily:
Charizard (a fire-breathing dragonlike Pokemon. 'Nuff said.)
Blastoise (Water cannons. Two of them. Mounted on its BACK. With high accuracy from
160 feet.
And can
PUNCH HOLES THROUGH THICK STEEL.)
Ash's Pikachu: see nearly
EVERY DARN POKEMON EPISODE, SPECIAL, AND MOVIE IN EXISTENCE
Fearow (there's a reason why it took a powerful Thunderbolt just to take out its
pre-evos/spawn)
Beedrill (likely as nasty as bees in real life)
Nidoking (Horn Drill=insta-KO)
Ninetales (yeah...considering all of my
Naruto anime experience, I've learned that you
do not mess with
kyubi.)
Dugtrio (very speedy Earthquaking mole that can Scratch me as well)
Golduck (a duck with psychic powers doesn't really bode well)
Primeape (gets pissed off very easily, and can pack a whallop with all of its fighting attacks. And beats up anyone who makes it mad,
even if it has to relentlessly chase him/her to the end of the world).
Arcanine (
very fast, a
liger-ish hybrid, and shoots flames)
Machamp (a humanshape Pokemon that doles out powerful punches at
1000 punches per 2 seconds? NO THANK YOU.
Alakazam (would likely crush my mind and/or toss me around like a rag doll fi I disturbed its meditation)
Dodrio: PECK! PECK! PECK! PECK! PECK!
NONSTOP. DRILL PECK!
Haunter/Gengar: they arguably have the creepiest Pokedex entries
ever.
Electrode: "Me go boom." A LOT.
Tauros: intimidating by looks alone
Gyarados:
very vengeful for the mistreatment it endured during its Magikarp days, and is renowned for its viciousness and city-demolishing capabilities. STAY VERY, VERY FAR AWAY.
Ditto: can Transform into my worst Nightmare. *shudders*
Aerodactyl: = Speed; would likely pin me down before I could even attempt fleeing.
Legendary Birds: see
Pokemon The Movie 2000: The Power of One.
Mewtwo/Mew: see Generation 1 metagame. And
Pokemon The Movie 1: Mewtwo Strikes Back, AND
Pokemon The Movie: Mewtwo Returns, AND
The Mastermind of Mirage Pokemon special, AND
Pokemon The Movie 8: Lucario and The Mystery of Mew.
Steelix: menacing by appearances alone. And it's STEEL/GROUND-type.
Tyranitar: RAMPAGES CAN
CAUSE MAPS TO BE REDRAWN. 'Nuff said.
Legendary Dogs: Re: Entei:
Pokemon The Movie 3: Spell of The Unown
Re: Suicune:
Pokemon The Movie 4Ever:
Celebi - Voice of the Forest
Re: Raikou:
The Legend of Thunder special
ALL OF THEM -
Pokemon The Movie 13: Zoroark, Master of Illusions
Lugia:
Pokemon The Movie 2000: The Power of One
Ho-Oh: trailer of
Pokemon Movie 13
Celebi:
Pokemon The Movies: 4Ever and
Zoroark, Master of Illusions. Not to mention a bunch of TV specials.
Blaziken: I can personally attest to its ferocity.
Sceptile: Walking, talking Leaf Blades ON SPEED.
Shedinja: soul-sucking ability just by its foes peering into its back.
Absol: most likely means that something cataclysmic is about to occur
Salamence: see Generation 4 metagame and Hoenn's Battle Tower.
Metagross: sentinent supercomputer with metallic brawn and PSYCHIC POWER.
Lati@s: Psychic dragon jet planes. Not even mentioning the amplifying Soul Dew.
Legendary Golems: They don't run from me like all those other wimpy Trios. Oh, no. They
WAIT for me to come and catch them, having been sealed away. What does that say of how confident they are in their abilities?
Weather Trio: see
Pokemon Emerald cutscene.
Jirachi: it can just
wish to whisk me out of existence.
Deoxys: Mutated by a space virus. And see
Super Smash Brothers Brawl.
Infernape: The Pokemon incarnation of
the Monkey King. AKA: GOKU/KAKAROT. OF
DRAGONBALL Z.
Lucario: skilled Aura/Chakra/Ki wielder. For reference, please see
Dragon Ball Z and
Naruto +
Naruto Shippuden. Also,
Super Smash Brothers Brawl.
Rampardos: monstrous Attack. Yikes.
Ursaring: whenever I see it, it tends to looks pissed off. Which is not a good thing.
Wailord: It could just smush me by mere size and sheer weight
alone.
Vespiquen: *shudders at what it could order its Combee minions/hive mind to have them handily dispatch of foes*
Spiritomb: So much mischief and misdeeds, it had to me bound to a stone for nearly 500 years.
Magmortar: Why would I even
think of messing with anything that's Fire-type with an arm cannon?
Dusknoir: Affiliation with the spirit world? See ya.
Legendary lake guardians/pixies: Especially Uxle- wipes out the memory of anyone it sees just by
opening its EYES. Also, Azelf can make humans lose willpower,
leaving them immobile for all eternity.
Legendary reality dragon trio: See DP movie trilogy. Also, Dialga is DRAGON/STEEL. And Giratina is the only Pokemon to date that was
banished to another realm as a renegade. Also, see
Super Smash Brothers Brawl.
Heatran: Fire/Steel with the ability Flash Fire sounds horrendous to
combat.
Regigigas: so terrible, the keys to
unlock it had to be sealed in
a whole other region. And it's capable of
towing continents.
Cresselia: despite its benevolent nature, see
Super Smash Brothers Brawl. Again.
Darkrai: activates nightmares as
a defense mechanism.
Arceus:
created all Pokemon, and has
the highest Base Stat Total in existence. And see
Pokemon The Movie: To The Conquest of Space-Time/"Advent of Arceus".
Victini: brings victory
wherever it goes, regardless of the opponent's typing.
Emboar:a wrestling fire pig. Related to the Monkey King. And looks like a Walking, talking BOMB. Not even mentioned Reckless+ its powerful recoil-damage attacks.
Samurott: mistreated as Oshawott/Wotter by a portion of the fandom, and it's a freaking SAMURAI SEA OTTER. And when it goes bipedal, you
know your about to get your butt thoroughly kicked.
Zoroark: nightmarish illusions...
Golurk: The Pokemon equivalent of the
Megazord. With FEET ROCKETS.
Braviary: a punishing, courageous foe, I suspect.
Bisharp: Just freaking LOOK at
*bulbagarden.net image removed*. Also, see
Power Rangers/Super Sentai and
Kamen Rider. ALL seasons.
Hydreigon: A puppeteering hydra with one head that possibly
subdued the other two heads without regret.
Haxorus: HAXX. DINOSAUR. AXE-FACE. SCARY BY DEFAULT.
Ulgamoth: A moth that can WITHSTAND flames, while doing some eerie dances as well.
Legendary Musketeers: Skilled in sword combat. *shudders*
Legendary Kami: Fabled of their potent abilities.
Legendary Tao Dragon Trio: 1. Their tails. 2. Their elements. 3. Their signature moves. 3. Their
origin. Also, Re: Zekrom: BW001 -
In The Shadow of Zekrom!
Genosect:a genetically-modified metallic bug cockroach engineered by a crime syndicate with a
NUCLEAR CANNON ON ITS BACK.
Personally, any and all Pokemon that are evolved, exlcuding intentionally cute ones, or any first-route trash Pokemon, can kill a human being whenever it feels like, however it feels like.
Yeah...considering most first Routes have those annoying little kids that block you from mere
rodent Pokemon, pretty much all of them pack the potential to be devastating. 0_o