From Bulbapedia, the community-driven Pokémon encyclopedia.
Santalune Gym (Japanese: ハクダンジム Hakudan Gym) is the official Gym of Santalune City and the first Gym the player character challenges. It is based on Bug-type Pokémon. The Gym Leader is Viola.
In the games
The first room contains multiple frames of Pokémon, the room below, accessed via rope, is a giant spider web, trainers are on platforms. Lastly, Viola is on a wooden area, after defeating her, one of the frames in the first room opens, which is an exit.
Trainers
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Reward: $1920
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Items
In the anime
This gym appeared in XY005, where Ash challenged Viola to a gym battle, but lost. The gym will reappear in XY006 for Ash's rematch.
In the manga
This gym has yet to appear in any Pokémon manga.