After 60:31 of game play I defeated the Elite Four and the Pokémon League Champion moments before the new year with these guys;
Greninja Lv. 76 ♂ OT: Mike 55259
Timid | Torrent | Amulet Coin
Ice Beam | Waterfall | Surf | Extrasensory
226 | 157 | 132 | 193 | 120 | 246
Charizard Lv. 75 ♂ OT: Mike 55259
Modest | Blaze | Charizardite Y
Air Slash | Solar Beam | Heatwave | Flamethrower
224 | 154 | 154 | 232 | 145 | 205
Meowstic Lv. 75 ♀ OT: Mike 55259
Gentle | Infiltrator | Mind Plate
Psychic | Shadow Ball | Thunderbolt | Signal Beam
223 | 108 | 129 | 152 | 161 | 207
Nidoking Lv. 75 ♂ OT: Mike 55259
Jolly | Poison Point | Rocky Helmet
Earthquake | Megahorn | Poison Jab | Fly
217 | 192 | 152 | 148 | 141 | 180
Staraptor Lv. 75 ♂ OT: Mike 55259
Jolly | Intimidate | Sharp Beak
U-turn | Close Combat | Brave Bird | Fly
234 | 218 | 126 | 104 | 120 | 207
Serperior Lv. 75 ♀ OT: Mike 55259
Docile | Overgrow | Miracle Seed
Leaf Blade | Toxic | Aerial Ace | Energy Ball
211 | 152 | 163 | 139 | 155 | 212