FusionDex.org

Magider latches onto Slowpoke tails like Shellder, though no evolution takes place. Instead, Magider uses its host as a way of migrating to a new body of water to reside in, as its own swimming capability is quite weak.

At night, it burrows a hole in the seafloor with its broad tongue to make a place to sleep. Its swimming muscles are weak, so it is easily washed away by currents.