Swampert first appeared as a Mudkip, playing in the water that was given by May. It later battled against Roxanne's Nosepass and it evolved into Marshtomp after it stopped Nosepass' Rock Tomb. It eventually evolved into Swampert, being able to Mega Evolve. It then showcased its Mega Evolution form while swimming in the water quickly, showing its ability Swift Swim.
None of Swampert's moves are known.