The only Pokemon that can learn Hydro Cannon are: Blastoise, Feraligatr, Marshtomp, and Empolion.
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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
You will have to trade or make it learn hydro pump
it does not learn hydro cannon you have to get the tm hydro cannon
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.
No, Palkia is not capable of learning Hydro Cannon.