In Pokémon Ruby, the Hydro Pump move can be taught to Water-type Pokémon through a Move Tutor located in the Lilycove City Department Store. The Move Tutor is on the rooftop of the department store and will teach Hydro Pump to a compatible Pokémon in exchange for a Blue Shard. Blue Shards can be obtained by using the move Rock Smash on rocks in various locations throughout the game.
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Swampert does not learn Hydro Pump.
In the most recent versions of Pokémon Pelipper naturally learns Hydro Pump at level 58. However in the versions Pelipper was introduced in, Ruby and Sapphire, it will learn Hydro Pump at level 61 instead.
The only way for Swampert to learn hydro pump is to let Mudkip learn it at level 42, sorry.
You cannot find hydro pump. The reason is because it is not a TM. Most water Pokemon can learn it when they have reach a certain level.
There isn't a TM called hydro pump you can only get a Pokemon to use if it can learn it leveling up