From Bulbapedia, the community-driven Pokémon encyclopedia.
Peanut (Japanese: ピース Peas; full name Green Peas) is a character in Pokémon PiPiPi Adventure. His birthday is February 14, and his blood type is O. His older brother is Pistachio, and his only Pokémon is Charmander.
Peanut is extremely weak and sickly; even the act of sitting up too fast or walking for a few minutes can leave him out of breath. He's also prone to fainting; when Charmander first met him, Peanut was passed out in the middle of a Beedrill nest.
Peanut first appears in Charmander's Peanut, where he and Charmander are trying to find the legendary Fruit of Great Strength. However, due to Peanut's misreading of a map, they never do find it. Charmander is often annoyed with Peanut's "Wimpiness".
Peanut's sickliness is caused by a concentration of dark qi, as is revealed by Plum and Chansey.