sorry but the only way is to breed with
Gyarados
Chinchou,
Lanturn
Qwilfish
Wailmer,
Wailord
Relicanth
yet i dont know the level
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Salamence can only learn Hydro Pump as an egg move in Pokemon Emerald.
The only Pokemon that can learn Hydro Cannon are: Blastoise, Feraligatr, Marshtomp, and Empolion.
defog is not in emerald,
Swampert does not learn Hydro Pump.
You will have to trade or make it learn hydro pump