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a water / fire gym with hot springs and shell-based pokemon – there's a rivalry between pure fire and pure water gym members and you may get caught up in some double battles –the shell theme means some trainers may use things like ferroseed, turtwig/grotle, and certain bug pokemon – most shell mon will make an appearance
the gym leader is based on master roshi, he is old an apparently a mere shell of his former self (hence shedinja)– in postgame you can battle again, he is reinvigorated and his team now features an alolan golem (shell shock)
>Wartortle
ability: Torrent
Rapid Spin
Scald
Ice Punch
Yawn
>Carracosta
ability: Solid Rock
Aqua Jet
Crunch
Rollout
Protect
>Torkoal
ability: Drought
Flamethrower
Explosion
Body Slam
Rapid Spin
>Turtonator
Solar Beam
Shock Wave
Flamethrower
Dragon Tail
>Shedinja
item: Focus Sash
Will-o-Wisp
Toxic
Heal Block
Double Team
win the Kame Badge (or just Shell Badge), a shell with a star on it, TM would be Dragon Tail