Boys Pokémon Onesie. Pika Pika! This Pikachu onesie is simply electric! Your Pokemon Master will be super cosy in this awesome Pikachu all-in-one showcasing an awesome hood which features Pikachu's signature ears and embroidered face. The back of the onesie features detail embroidery depicting Pikachiu's tail and back print, so your Pokemon trainer can be just like their favorite Pokemon! Complete with a Pokéball zipper pull and a Pokemon logo on the leg, this cool onesie will surely be a hit with any fan!