Clarissa's Charizard

Clarissa's Charizard is the first Pokémon she obtained in Kanto as a Pokémon Trainer.

With Clarissa
Clarissa obtained Charizard as a Charmander from Professor Oak. He is shown to be a very strong fighter in battles, winning Clarissa a gym badge on many occasions. Charmander is also a result of rapid evolution as he stayed in his first stage until he protected Clarissa, then evolved into a Charmeleon and directly into a Charizard.

Personality
Clarissa appears to be an angry fire-type to many Pokemon but is actually a big sweet heart. Charizard is shown to be fiercely loyal to his trainer and even preserved it flame in order to save her.