Swampert

Water

Swampert has a phenomenal Water / Ground typing that leaves it with only one weakness and provides Water teams with a very important Electric immunity. Furthermore, Swampert has access to a wide array of useful utility moves to support the team such as Stealth Rock and Roar. Its amazing bulk allows it to take hits and safely set entry hazards or run defensive sets as Mega Swampert. Mega Swampert is a solid sweeper as well thanks to gaining Swift Swim as an ability, outspeeding many offensive threats in rain such as Landorus, Mega Lopunny, and Tapu Koko. However, Swampert is held back by an unfortunate lack of reliable recovery and therefore no longevity. Furthermore, it has a 4x weakness to Grass-type moves, which is very counterproductive for Water teams. Another setback for Swampert is that it has no offensive presence unless it's Mega Swampert, and despite an amazing base 150 Attack stat, Mega Swampert is often walled because it lacks a wide pool of reliable coverage moves. It is also completely crippled by burns, as it will no longer be the great wallbreaker it was. Lastly, despite Swampert’s solid bulk, its vulnerability to residual damage prevents it from switching in and out of the battle constantly.