In Pokémon Ruby, Sapphire, Pokémon Colosseum, Pokémon XD and Pokémon Emerald, the Water-type move that Lombre learns is Water Sport which it learns at Level 31. The next Water-type move that Lombre learns is the last one that it can learn via level-up which is Hydro Pump at Level 49.
In Pokémon Platinum, Pokémon HeartGold and SoulSilver, the first move that is Water-type that Lombre learns is Water Sport which is at Level 19, the next Water-type move that it learns is BUbblebeam at Level 25 and Hydro Pump is the last Water-type move and the last move it learns which it learns at Level 45.
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Lombre does not learn Water Gun,but does learn Hydro Pump
It doesent learn a water type move until level 49, wich is hydro pump. But his evolotion ludicolo is quite a good pokemon. NOTE THIS: If you evolve lombre before level 49, ludicolo wont learn hydro pump. But still, lombre and ludicolo can learn many water type tm and hm's. You cant get a water stone to evolve lombre until you have gotten dive, wich is after you have beaten the seventh gym. But i could totally recommend it. I have used it before on my team, and i didn't have any problems with it.
the lotad family: Ludicolo, Lombre, or Lotad. They are water/grass types
it can learn a range of different moves it's best one is hydro pump and to evolve it into a ludiclolo you will need a water stone.
It would be best, in my opinion, to just evolve it into Ludicolo. The physical Pokemon is more important then one move.