In the foggy Route getting to Celestic town, you may find Swabluin at level 27 and 28
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you can't get altaria but you can get swablu then evolve it, swablu is in route 210
Swablu evolves at level 35 into altaria.
raise to lvl 35
You can find it on the right of Celestic town in route 210. It is quite rare and you don't need a poke radar for it. you can get them at about level 27.
Swablu is unobtainable in FireRed and LeafGreen; the only way to get it is to trade from Ruby, Sapphire, Emerald, Colosseum, or XD after obtaining the National Dex. You can trade a Swablu Egg or trade an Altaria and breed it if you want a Swablu with your trainer ID, but you can only find wild Swablu in other games.