For Go’s final Project Mew Trial Mission, he elects to head to the Crown Snowfield to go after Regieleki and Regidrago. Go reunites with Shigeru, and the two head into the Ruins of Decision. Go and Shigeru are forced to work together after they are ambushed by fellow Project Mew members. The two defeat Shunya and Lyla in a battle, allowing them to have a crack at capturing the Legendary Pokémon first. Go and Shigeru eventually capture Regieleki and Regidrago respectively and pass the Trial Mission, with the both of them earning three Mew tokens. Go and Shigeru both qualify as Chasers along with Tokio. (Source: Wikipedia)
