Marshtomp, the Mud Fish Pokémon. Marshtomp is the evolved form of Mudkip. It is able to move and swim more quickly through mud than through water.
– Ash’s Pokedex
Everyone lieks Mudkips, but what about Marshtomp? Marshtomp looks quite happy. I like how its back fin looks like a mohawk. I had a Marshtomp in Emerald. It was useful, but at the same time, because it’s now Water/Ground, it’s doubly weak to May’s Grovyle.. but I like Water/Ground since it only has that one Grass weakness.
Marshtomp is shown to stand on its hind legs, while Mudkip was on all fours. When it evolves into Swampert, it goes back to all fours again. Marshtomp is the only 2nd stage Water starter with dual type.
In the anime, Brock’s Mudkip evolved into a Marshtomp, and it stayed as such. It’s a bit odd how Brock has a Water/Ground type, since Rock is weak to both, haha. (He also had a Ludicolo, which is super effective against Rock types)
Stat-wise, it has good defenses and good Attack, but relatively low Speed. Unfortunately it gets a somewhat useless ability in the Dreamworld, Damp. Wish it got Water Absorb instead.