The Pichu were first encountered when they were eating apples, since they were hungry. A Fearow went to attack them, but Ash's Pikachu protected them. Charmaine allowed them to eat, then they worked. After they defeated a bunch of Pidgey (who were after the apples), they harvested the apples and ate some of which Charmaine gave them. Team Rocket stole Pikachu, so Pichu powered him up to blow their balloon. Charmaine saw some potentional in the Pichu, so allowed them to stay.