Chikorita is one of Mudkip's childhood friends she used to play with. She became a member of Mudkip's newly formed team: Pokemon Mystery Dungeon Rescue Team. She with the other Pokemon befriended an Eevee who was originally a human girl.
Chikorita is a very clueless, but friendly Pokemon. Half the time, she has no idea what's going on and is often the target of danger.