The Battle Park owner's Charizard is a fire/flying-type Pokémon owned by the Battle Park owner.
When the Battle Park's owner left to get supplies, Team Rocket took Charizard, Venusaur and Blastoise, challenging Ash to three battles. Jessie used Charizard against Ash's Totodile. Charizard mostly used non-fire-type moves, though Totodile managed to defeat it in the end. Team Rocket used those Pokémon once more, but the Pokémon blasted them off, recognizing the Battle Park owner as their true owner.