No you cannot physically get Swampert in FireRed instead you will have to trade for one.
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Swampert is a Water and Ground type pokemon.
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In Pokemon firered you can't, but in Pokemon leafgreen you can get it then trade it to Pokemon firered.
Swampert does not learn Hydro Pump.
You can't get any of the Hoenn starters Sceptile (Treecko), Blaziken (Torchic), or Swampert (Mudkip) in FireRed/LeafGreen; you'd need to trade from Ruby/Sapphire/Emerald. If you do trade a Sceptile, Blaziken, or Swampert (or one of its previous forms) from RSE, you should probably mate that Pokémon with a Ditto in your RSE game first. After you hatch the egg in Ruby/Sapphire/Emerald, you can either trade that baby starter or the original higher-level Pokémon to your FireRed/LeafGreen. That way, you have one form of the starter in one game and another form of the same starter in the other game.