While training Nyabby, who's having trouble mastering Fire Fang, Satoshi accidently incurs the wrath of an unfriendly Sunabaa when Iwanko's Rock Throw knocks the shovel off its head. Satoshi's attempt to replace it (temporarily) with Rotom-Dex only makes things worse. and in a rage it evolves into Shirodesuna and swallows up Satoshi and also Nyabby when it tries to rescue him. With both Nyabby and Rotom-Dex affected by Shirodesuna's energy drain, now it's up to the rest of Satoshi's classmates to save them. While Kaki and the others keep Shirodesuna busy, can Pikachu and Ashimari find the lost shovel in time?