The body is soft and rubbery. When angered, it will suck in air and inflate itself to an enormous size.
– Pokemon Blue/Red Pokedex
Wigglytuff is based on a balloon, though it looks like a rabbit due to the ears. Its white belly looks a bit like a beard, haha.
Stat-wise, Wigglytuff has a lot of HP. It evolves with a Moonstone, so it doesn’t learn many moves by level-up after evolving, but it can learn lots of TM moves.