Pichu

Pichu (ピチュー, Pichuu) is an Electric-type baby Pokémon introduced in Generation II. It evolves to Pikachu when its Friendship stat reaches max level.

Character description
Pichu is a very small, plump, yellow rodent-like Pokémon. It bears a similar appearance to its evolved form Pikachu, but varies in a number of ways. Pichu has diamond-shaped ears on the top of their head, with the edges being black and the interior yellow. Underneath its head is a black pattern, that somewhat resembles a collar. Its tail is completely black, and resemble a small lightning bolt, similar to its evolved forms, which are larger. Pichu also has round, pink sacs on their cheeks, used for storing electricity.

Pichu has the special ability Static. This allows for a 30% chance that an opponent will become paralyzed if it lands a physical attack on Pichu. Pichu, like its other forms, is capable of storing electricity in the pink sacs on its cheeks. Being a baby Pokémon, however, Pichu can not store as much electricity as its evolved forms. It will shock itself if any electricity leaks out of its cheeks.

In Super Smash Flash 2
In Super Smash Flash 2, was revealed as a playable character on Day 4 of Super Smash Con 2017. It also appears as a Pokémon that can be released from a Poké Ball and will use Thunder Wave to damage nearby enemies.