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Late game, theme is Heraldic Beasts.
Gym has two parts, a "hunting ground" which has exotic wild Pokemon in the tall grass, and trainers patrolling grounds for rare catches, and challengers to test their mettle against.
The Gym leader is located in a small facility in the center of the grounds. He gives you the Royal Badge, and I can't really think of a good TM.
>Sawsbuck
Swords Dance
Horn Leech
Jump Kick
Wild Charge
>Braviary
Brave Bird
Crush Claw
Roost
Superpower
>Ursaring
Thrash
Payback
Rest
Sleep Talk
>Pyroar
Hyper Voice
Flamethrower
Snarl
Noble Roar
>Drampa
Glare
Dragon Pulse
Hyper Beam
Fire Blast