A Pokémon Gym Leader is the head Pokémon Trainer in any given gym in all of the Pokémon video games. The Gym Leaders and the types of Pokémon they specialize in are varied depending on the version.

Red / Blue and Yellow Versions

Gold / Silver and Crystal Versions

Johto Gym Leaders

Kanto Gym Leaders

Ruby / Sapphire and Omega Ruby/Alpha Sapphire Versions

Emerald Version

Diamond / Pearl and Pokémon Platinum Versions

Black / White Versions

Black 2 / White 2 Versions

X / Y Versions

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