Swampert does not learn Hydro Pump.
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The only way for Swampert to learn hydro pump is to let Mudkip learn it at level 42, sorry.
The only way to let swampert learn hydro pump is to train mudkip to level 42 then let him evolve
Feraligatr can learn Hydro Pump at level 58 in Pokemon Crystal.
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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.