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.
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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
In the foggy Route getting to Celestic town, you may find Swabluin at level 27 and 28
Check your radio and go to Mary & Oak and if they say something about SWABLU then go to the place they tell you to go to and eventually you'll find one.