Mumu/History/ORAS

In Omega Alpha Adventure 3, Mumu, alongside Chic and Sceptile, trained under Ultima in order to fully master the. The training was issued by Steven Stone and Mr. Stone as part of a plan dedicated to preventing a giant meteoroid from crashing into the planet. With Ruby having business elsewhere, Steven trained Mumu in his 's stead. When Ruby returned in Omega Alpha Adventure 8 to stop the attack Zinnia lead on the Sea Mauville, he Mega Evolved Mumu for the first time and used him to battle Zinnia's.