Wild Tapu Koko in Alola, International Pokédex Wiki

Tapu Koko is a Legendary Pokémon living on Melemele Island, Alola. Tapu Koko appears to be a serious Pokémon, giving Gladion an angry stare when he arrogantly yelled at it out of impatience. Tapu Koko is very interested in Ash, wanting to challenge him and test his skills. Tapu Koko also appears to have great faith in Ash, entrusting him a Z-Ring, an Electrium Z and Nebby.

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