This Mantyke is a Water/ -type Pokémon owned by the Pokémon Summer Academy.
Mantyke was used in the second part of the Summer Academy triathlon by Ash Ketchum to get across the lake. Ash and Mantyke mostly raced against Angie and her Lapras during the race. When Ash arrived at the third part of the thriathlon, Ash recalled Mantyke and left its Poké Ball in a box, returning it to the Summer Academy.
None of Mantyke's moves are known.