Pikachu almost fell into lava after a fight with Magmar in an arena above a volcano. Charmander was allowed to fight in a water arena where he could fall into water. It's a deadly sport without safety rules. Has any Pokemon been depicted dying in a fight?

Pikachu almost fell into lava after a fight with Magmar in an arena above a volcano. Charmander was allowed to fight in a water arena where he could fall into water. It's a deadly sport without safety rules. 

Has any Pokémon ever been depicted dying in a fight?