Why karate king in his gym Pokemon crystal?

There's no character called "Karate King" in Pokémon Crystal or any other Pokémon game.

It's possible you're thinking of a different game or character. Could you provide more information about what you're looking for?

For example:

* What is the character's role in the game? (Gym Leader, trainer, etc.)

* What is the character's name or appearance?

* What city or area does the character appear in?

With more details, I can help you find the character you're thinking of!