Notes:

From Serebii
English Name: Tapu Koko
Jp. Name: Kapu Kokeko (カプ · コケコ)

Type: Electric/Fairy-type
Classification: Land Spirit Pokémon
Height: 5'11"
Weight: 45.2lbs
Ability: Electric Surge

Details:
This Pokémon was hinted at during the E3 Treehouse Live and is the guardian of Meremere Island. It is seen under the control of Hala. It was leaked and then revealed officially on June 30th 2016

Tapu Koko is a special Pokémon that protects the area where it lives. It’s called the guardian deity of Melemele Island, one of the islands of the Alola region. Although it’s known as a guardian deity, it’s a surprisingly fickle Pokémon, and will not necessarily come to your aid if you need help. Despite that, this Pokémon has a strong sense of curiosity. If it becomes interested in a person or in other Pokémon, it may come to play or battle with them. Tapu Koko can store up electricity by enclosing itself in the shells on its arms. And it also appears to enter this form during other, special times…