Mumu/History/Em

In Cunning Kirlia, Mumu advanced Ruby through the Battle Dome. Despite being one of his three options to fight against he was not used.

In Facing Gulpin Is Hard to Swallow, Mumu helped Ruby, Sapphire, Emerald, and advance through the  to reach Guile Hideout.

In The Final Battle III, Mumu is taught. He was soon used alongside Blasty and Silver's Feraligatr to attack with Hydro Cannon to help destroy Guile Hideout's fake.