Maggyo

Maggyo is a flat, fish-like Pokémon with a broad, mud-brown body. At the base of its yellow tail is a yellow marking shaped like an exclamation mark when seen from behind. It has small, horizontal, oval-shaped eyes, white with a tiny black pupil and no irises. Almost exactly between these two eyes lies the two thick gray lips that form its mouth. It has two small, flimsy fins at the sides of its body; each with two lobes. It has been seen to leap into the air and flap its fins as if they're wings to remain airborne.

Maggyo's very tough skin keeps them unharmed if stepped on, even by sumo wrestlers. To exploit this, it buries itself in mud of the seashore and waits for prey to pass by. Whenever unsuspecting prey touch a Maggyo's body, it is zapped. Maggyo smiles when electrocuting its foes. If it cannot paralyze its foe, it contorts itself with unexpected speed and flops away.

Galarian Maggyo is grayish-brown, with three green markings similar to footprints on its body. It cannot generate electricity, but the high iron content of the mud it lives in has strengthened its fins, which have been adapted into an apparatus akin to a bear trap. Galarian Maggyo leaves its red and white mouth, which look similar to a Pokéball, visible to lure in prey, and then slams its fins shut on them so they cannot escape.

(Source: Bulbapedia)