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.
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swampert can not learn hydro cannon in R/E/S it can only learn hydro cannon in Pokemon pearl/platinum/diamond SEE YA
Hydro Cannon
The only way for Swampert to learn hydro pump is to let Mudkip learn it at level 42, sorry.
Why do you need a cheat code for Hydro Cannon????????????????????????????? If you have a Blastoise, Swampert, Feraligatr, or Empoleon you just have to bond with it and you can learn the move WITHOUT messing up your game with hacks.
There isn't a TM for Hydro Cannon. You water Pokemon learn it from a guy in the desert at route 228. His house will be by a pond. Go in and talk to him and he will teach your Pokemon Hydro Cannon (water types only). Note: You have to be well bonded with your Pokemon before he will teach it.