swampert can not learn hydro cannon in R/E/S it can only learn hydro cannon in Pokemon
pearl/platinum/diamond
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Hydro Cannon
The only way for Swampert to learn hydro pump is to let Mudkip learn it at level 42, sorry.
Swampert does not learn Hydro Pump.
it does not learn hydro cannon you have to get the tm hydro cannon
to teach swampert hydro cannon u have to go to the dude who teaches moves for a heart scale in fallabor town. but swampert has to be a certain level. you can also breed a female mudkip, marshtomp, or swampert with a male in the monster or water 1 group that knows hydro cannon and the move might transfer to the baby.