you cant only in Pokemon pearl,diamond and platinum
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The only Pokemon that can learn Hydro Cannon are: Blastoise, Feraligatr, Marshtomp, and Empolion.
Salamence can only learn Hydro Pump as an egg move in Pokemon Emerald.
You will have to trade or make it learn hydro pump
swampert can not learn hydro cannon in R/E/S it can only learn hydro cannon in Pokemon pearl/platinum/diamond SEE YA
You can't its not a move in emerald.