Pachirisu

Diamond +2: It makes fur balls that crackle with static electricity. It stores them with berries in tree holes.

Pearl: It makes electricity with pouches in its cheeks and shoots charges from its tail. It lives atop trees.

Platinum +6: A pair may be seen rubbing their cheek pouches together in an effort to share stored electricity.

HeartGold / SoulSilver: It’s one of the kinds of Pokémon with electric cheek pouches. It shoots charges from its tail.

Legends: Arceus: A species related to the Pikachu line. Though Pachirisu is a calm Pokémon, it still presents a danger should one touch its electrified tail or cheeks.