Mega Man Star Force 2
Plesio is given to Gerry by Hyde to stir up trouble in Loch Mess. Gerry sees this as an opportunity to boost the ratings for his show using Plesio to pose as the legendary Messie. They EM Wave Change and attack Mess Village, but is defeated by Mega Man.
Later on, while copies of Plesio harass the people throughout the world, Plesio Surf returns again on the Mu continent, using a Murian to perform an EM Wave Change, and attempts to stop Mega Man from proceeding. Once again, he is defeated.
Plesio is a resident UMA to Dombler Lake (Loch Mess), and prefers the peace and quiet he had before the rumors of a monster named "Dossy" (a reference to "Nessie", the real world's Loch Ness Monster) surfaced. Since then, there were always people near his lake trying to look for "Dossy". When the skeptical Gerry arrives with his investigative team, Plesio forcibly Wave Changes with him to Plesio Surf and attempts to scare people off.
When Geo Stelar and Harp Note reach the lake, Plesio makes an appearance and attacks the nearby people who have come to see "Dossy". Since then, people have started to believe in "Dossy" and they start selling "Dossy" merchandise. Plesio Surf then begins to attack the stores to drive the people out, but Mega Man and Harp Note confront him. Eventually, in the midst of the chaos, Rich Dotcom steals the Saurian (Dinosaur) OOPArt from the lake and runs away with it, with the OOPArt generating the image of a plesiosaur that dissipates after it leaves. This results in people thinking that "Dossy" has left the lake, and so the crowd dissipates over time. Plesio is now satisfied with the calm that has returned to his home, and does not think much of the loss of the OOPArt.