Well, I'd say that Surf is a fairly good water move. It also has decent pp. If your looking for power than i suggest hydro pump or hydro cannon. Although they dont have a lot of pp. Glad I could Help. Simon
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Most water type Pokemon can learn the move Waterfall.
The best normal type move for pokemon is explosion. ;-)
Most water types can learn that move like tentacool.
Most people would suspect the move hyper beam, but its not even near that, the move that Arceus leans at level 100, Judgement.
It would be hard to beat him without evolving it in to swampert first, because then swampert can learn muddy water. But marshtomp's most effective move should be Mud shot.