Morpeko first appeared in its Full Belly Mode in the Galar Region when Team Rocket trio Jessie, James, and Meowth found it eating their food. Jessie threw an empty can at it, but it dodged and ran away, and the can accidentally hit a camouflaged Sobble. Later that same day, after the Team Rocket trio had been defeated by Ash and Goh, Morpeko returned and asked for more food. When the trio rejected it and told it to scram, it transformed into Hangry Mode and used its Aura Wheel attack to send them blasting off.
It was next seen in Hangry Mode at the Team Rocket Trio’s secret base under Vermilion City, having somehow made its way to the Kanto Region. It had presumably followed Team Rocket all the way back from Galar. It proceeded to eat all of Team Rocket’s food again before disappearing. It was later seen again in its Hangry Mode by Team Rocket, eating the honey off of one of the trees that Ash, Goh, and Kricketina had lathered honey on in hopes of attracting a Pinsir. Team Rocket was starving and were afraid that Morpeko would steal from them again. When Morpeko finished the honey, it reverted back to Full Belly Mode.