FusionDex

It regularly plays pranks on fishermen. If the fisherman uses a rod, Mewder will dive underwater and attach their hook to detritus; if the fisherman uses a net, Mewder will float over to them and slap them with its long tongue.

At night, it burrows a hole in the seafloor with its broad tongue to make a place to sleep. A Mewder is said to possess the genes of all Pokémon.