Tapu Koko - SmashWiki, the Super Smash Bros. wiki

Tapu Koko is a creature from the Pokémon franchise.

Greninja (SSB4) - SmashWiki, the Super Smash Bros. wiki

Tapu Koko, Smashpedia

Character Concept- Moveset, Costumes, Animations and New Stage- Tapu Koko

Super Smash Bros. Ultimate

Greninja (Super Smash Bros.) - Bulbapedia, the community-driven Pokémon encyclopedia

Smashboards Creates: Smash from Scratch! (A Smash game from the ground-up), Page 22

I just realized that Tapu Koko was listed as a Pokeball Pokemon on the website, Super Smash Brothers Ultimate

Gallery:Super Smash Bros. Ultimate - Super Mario Wiki, the Mario encyclopedia

Charizard (SSB4) - SmashWiki, the Super Smash Bros. wiki

Pichu, Smashpedia