After defeating Cyrus and Giratina and saving the world, I went over to Route 222, where I beat some Fishermen with annoying Gyarados. Then I arrived in Sunyshore City, was directed to the lighthouse and found Volkner there. Going through the Gym, I beat all the trainers and made my way to the Gym Leader.
Jolteon was first, and I began with Margarita. I ate his Iron Tail for over 1/4 before Earthquake was an OHKO.
Luxray was next, and I had to get crafty since this one had Ice Fang. I switched to Blistering, and he did indeed use Ice Fang, which I took like a champ. My (Icicle Plate boosted) Ice Beam did over half, but he went for Fire Fang and brought me around 1/4 HP. One more Ice Beam finished him.
Raichu came after, and he used Focus Blast but missed, allowing me to get off Icy Wind and hit him for a nice amount and lower his Speed. Ice Beam didn't finish him, but he used Focus Blast and missed again, wow. He healed, but thanks to the lowered Speed, Ice Beam was a 2HKO.
Electivire was last and finished that off with Fire Punch. I went into Gorath to get off Intimidate (and the Amulet Coin), then switched to Margarita and ate his ThunderPunch. He used Quick Attack, and that only did 1/7 my health before Earthquake OHKO'ed for the win.
So after Volkner lied that that was the most fun he's had battling in a long time, I got the Beacon Badge and TM57 for Charge Beam, then went on the beach where I met Jasmine and Barry, and got HM07 for Waterfall. I went up Route 223 and beat most of the swimmers there, getting my team to Level 45 before entering the Pokémon League. I went through Victory Road, going through all the trainers, the hardest being the last Veteran with a disaster of a Porygon-Z that did massive damage and was faster than most of my team. I reached the league castle, with my entire team being Level 46/47.
After healing up, I took on Barry. Staraptor was OHKO'ed by Mane's Thunder, Torterra with Blistering's Ice Beam, Rapidash with Flipper's Surf, Heracross with a critical hit Waterfall from Gorath, Snorlax with some Waterfalls followed by Stagger's Brick Break, then Floatzel with Close Combat.
With him defeated, all I had remaining to do was train my team up. Flipper was probably the easiest to get out of the way since there were Steel-types in Victory Road to easily KO. I got Stagger out of the way after, then Blistering and Mane followed suit. Once I was done with those four, I then used my 12 Rare Candies to get both Gorath and Margarita - and with that, my entire team - to Level 55, and Margarita became a Garchomp. After all my preparations were done, I went back to the Pokémon League!
Aaron was first, and he began with Yanmega, in which I went with Blistering. He started with Double Team, and I missed with Ice Beam. But he then used U-turn and went to Scizor, who actually took almost half from Ice Beam. But regardless I went to Flipper, ate his Iron Head like nothing, then set up Stealth Rock as he used X-Scissor for not much either. I had 4/5 my health before I killed him with (Wave Incense boosted) Surf.
Heracross came after, and I switched to Gorath to get off Intimidate as he used Close Combat, which I took pretty easily. After Stealth Rock damage, a Defense drop and the Mystic Water, Waterfall finished him.
Vespiquen came next, taking half its health from Stealth Rock. I went over to Mane, got off Intimidate and he used Heal Order. I used Charge as he went for Attack Order for less than 1/5. Spark busted him in one hit.
Drapion came next, and I went over to Margarita, taking his Cross Poison for pathetic damage before Earthquake killed him.
Last was Yanmega again, who took Stealth Rock damage before being torn a new one with Rock Slide for the win.
Bertha came afterwards. I decided to go with Stagger to begin against Whiscash. I started with Brick Break, which did JUST over half, as she went for Sandstorm. Another Brick Break killed her.
Gliscor came afterwards, and I switched over to Blistering for that, unfortunately right into Fire Fang, which did less than 1/3 but the sandstorm made that more. She used Earthquake, but I lived and hit through Sand Veil, OHKO'ing with Ice Beam. Then I had less than 1/3 my health left.
Golem was next, and I stayed in to slam her with another Ice Beam before the sandstorm subsided.
Rhyperior came afterwards, and I switched in to Flipper, but she used Earthquake, which I was hoping she wouldn't, and it was an OHKO. I switched in Gorath, who got off Intimidate before I used Waterfall, which OHKO'ed her thanks to the Mystic Water.
Hippowdon was last, and it summoned a sandstorm with Sand Stream. I used Dragon Dance before she got in Yawn, but Waterfall was an OHKO for the win.
Flint came afterwards. I started with Flipper against Houndoom, and he unfortunately started with Sunny Day, so my Choice Specs Surf came short of an OHKO. He wasted a Full Restore, though, so I went into Mane and took 2/3 from Flamethrower, but killed him with Spark.
He wasted no time in going into Infernape and killing me with Earthquake before the sunlight faded. I switched in Gorath and got off Intimidate, but he had ThunderPunch, which did JUST under half before OHKO'ing him with Waterfall, with a critical hit which I doubt I needed.
Magmortar came after, and he was faster and killed me with Thunderbolt. I went to Flipper again, and he used Thunderbolt, which came just short of knocking me into Torrent range, but Surf was still an OHKO.
Flareon came next and was promptly slammed by Surf.
Rapidash was last, and I switched to Margarita to eat his Flare Blitz, which hit for just under 1/5 before I beat him with Earthquake for the win.
Then we got to Lucian, ho boy. Against his leading Mr. Mime, I began with Stagger. I was thankfully faster and hit with Megahorn, OHKO'ing him.
Espeon came after, and I went to Flipper, taking 1/6 from Psychic. He used it again before I went for Surf, doing well over half. One more Psychic then I killed him.
Gallade came after, and I switched to Mane and got off Intimidate before he used Drain Punch for still over 1/4 without a critical. I used Spark, and did over half before his Sitrus Berry came in and healed him, then he used Psycho Cut. I used Spark again and paralyzed him, but he used Psycho Cut and left me with 1/10 HP. He healed, but Spark OHKO'ed him with a critical hit.
Bronzong came after, and I used Spark which hit for a decent amount, then he used GYRO BALL which I lived with 1 HP. I used Spark again and got him into the red before he killed me. I went for Stagger again, and sure enough he healed. But I hit with Megahorn for well over half, and hit with it next turn to kill him.
Alakazam was last, and I lived his Psychic with 2 HP (!!) before OHKO'ing him with Megahorn for the win.
After checking over my team one last time, I went in for the Champion, Cynthia!
Spiritomb was first, in which I began with Flipper. I used Surf, which was a 2HKO while her Dark Pulse got a critical hit and still only did just over 1/4.
Garchomp came next, and I switched into Gorath to get off the Intimidate and eat up her Earthquake. She then missed with Dragon Rush before I used Dragon Dance, then OHKO'ed her with a +1 NeverMeltIce boosted Ice Fang.
Togekiss came after, and I switched into Mane, eating her Shock Wave like a champ. I used Charge before she used Aura Sphere, and I still had just under 2/3 my health left. Spark was an OHKO.
Lucario came after, and I went over to Stagger, taking less than half before OHKO'ing her with Close Combat.
Milotic followed that, and I used Megahorn for over half, but her Surf unfortunately finished me off. Darn, it would've been awesome to do this without losing anyone! Nevertheless, Mane killed her with Spark.
Roserade was last, and I stayed in because I didn't want to switch in Blistering only to take more than half. She came short of killing me with Energy Ball, my Crunch did less than half, she killed me and then I went to Blistering, who took over half from Sludge Bomb, but finished her with Ice Beam, winning me the battle.
That was actually not as hard as I was prepared for; I tried to give my team good chances to fight and that worked pretty well, and I still managed to win without too much trouble. Granted she did miss with Dragon Rush (although admittedly I don't think that mattered too much given Intimidate), and my team was admittedly very strong but given my levels I anticipated more than I was dealt.
That said, Cynthia and Professor Rowan went into the Hall of Fame with me, where my team was inducted as Champions!
