Swampert is a bipedal Pokémon. It has a large cobalt blue body and large three-fingered hands. It has two orange gills that protrude from round patches on its cheeks. Its head has two large semicircular black fins that extend from the top of its orange eyes to the back of its head. Its tail fin is big, broad, and black. It has a white underside and orange ridged portions above its hands and three-toed feet.
Swampert is very strong with enough power to easily drag a boulder weighing more than a ton, batter down opponents, and swim faster than a jet ski. It has powerful vision, enabling it to see even in murky water. Swampert also has the ability to predict storms, sensing subtle differences in the sounds of waves and tidal winds with its fins. When a storm is approaching, Swampert will pile up boulders to protect its nest. It makes its nests on beautiful beaches.
As Mega Swampert, this Pokémon gains considerable bulk. Its upper body and arms are more muscular, while its lower body is smaller in comparison. The raised patches above its feet vanish, but it gains two additional ones on each wrist and one on each shoulder. The bumps and its gills become a darker, redder shade of orange, and the gills are now larger and extend slightly past its mouth. The black fins on its head are shorter, more streamlined, and extend down past its shoulders. The tail fin now forms a short ridge that extends up to this Pokémon’s forehead. Mega Swampert's fingers and toes are more defined, and its fingers turn black. According to the anime, Mega Swampert fills the organs on its back with air before diving underwater or battling. It uses that pressure to increase the power of its punch.
Swampert debuted in Abandon Ship!. It evolved from a Marshtomp that was living in an abandoned ship ever since it was separated from its Trainer Tommy. Since then, it believed that Tommy had abandoned it. When Ash and his friends arrived on the abandoned ship and ran into Tommy, they started to get captured by Swampert one by one and trapped in the webbing of its Spinarak partner until only Ash, Brock, Tommy, and Pikachu were left. After getting Swampert to remember him, and informing it that it wasn't abandoned after all, Tommy ended up reuniting with Swampert.
Swampert, the Mud Fish Pokémon. Swampert is the evolved form of Marshtomp. It is able to easily drag large stone weighing over 1 ton. It is also able to see through cloudy waters and detect approaching storms with its fin.
This concludes the entries from the Advanced Generation series.