Details: One of the fourteen Special Trainers you will encounter at The Battle Tree after completing certain winning streaks or as a partner in Multi Battle Mode is Wally. As your former Rival in the Hoenn Region, Wally has continued to get stronger.
Possible Pokemon:
Altaria (Altarianite): Dragon Dance, Dragon Rush, Giga Impact, Earthquake
Altaria (Wide Lens): Cotton Guard, Sing, Moonblast, Dream Eater
Garchomp (Choice Scarf): Outrage, Earthquake, Fire Fang, Crunch
Magnezone (Bright Powder): Charge Beam, Flash Cannon, Magnet Rise, Thunder Wave
Magnezone (Assault Vest): Thunderbolt, Flash Cannon, Tri Attack, Volt Switch
Gallade (Scope Lens): Psycho Cut, Stone Edge, Shadow Sneak, X-scissor
Gallade (Galladite): Psycho Cut, Close Combat, Rock Slide, Destiny Bond