The next Pokémon GO event has been announced as a tie in with One Piece. It will run from July 22nd to July 29th. The event will feature a special straw hat Pikachu that will appear in game, along with a straw hat outfit for trainers. A special One Piece statue will also be placed in Kumamote, Japan with special art from One Piece creator Eiichiro Oda. This is too support the Kumamote prefecture help rebuild after an earthquake earlier in the year.
Source – Serebii.net