Details: One of the thirteen Special Trainers you will encounter at The Battle Tree after completing certain streaks with the multiple of ten in single player modes or team up with in multi-Battle mode is Cynthia, the Champion of the Sinnoh Region. She only has five possible Pokemon species on her team, resembling her teams of previous generations.
Possible Pokemon:
Milotic (Wide Lens): Hydro Pump, Blizzard, Mirror Coat, Recover
Milotic (Leftovers): Ice Beam, Rest, Sleep Talk, Surf
Spiritomb (Leftovers): Will-o-wisp, Shadow Sneak, Swagger, Psych-Up
Spiritomb (Custap Berry): Will-o-wisp, Sucker Punch, Substitute, Pain Split
Garchomp (Choice Scarf): Outrage, Earthquake, Fire Fang, Crunch
Garchomp (Garchompite): Sandstorm, Stone Edge, Earthquake, Dragon Claw
Lucario (Lucarionite): Close Combat, Rock Slide, Blaze Kick, Bullet Punch
Lucario (Weakness Policy): Aura Sphere, Dragon Pulse, Stone Edge, Extreme Speed
Togekiss (King's Rock): Grass Knot, Thunder Wave, Air Slash, Shadow Ball
Togekiss (Expert Belt): Aura Sphere, Air Slash, Grass Knot, Dazzling Gleam