Hello
Firstly breeding a swablu with perfect Iv's is a mission on its own, HERE, for IV explanation (breeding)
Here's an example of a set that maybe useful, Smogon university (Altaria set's) and below for quick referance guide to OU battling that is uncommon in 2018, because its a monotype and unlikely always used:-
Altaria @ Altarianite STAB comes when mega evolved
Ability: Natural Cure
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature (quick)
- Return (TM-27) for you s/m (pixilate ability from mega evolve adds STAB, normal move converted to STAB PIXILATE
- Dragon Dance (altaria, will need move tutor, learned at lv 30 HERE but swablu evolves at lv 35, altaria learns, upon evolving.) for u-s/m
- Roost (TM-19) for u-s/m
- Earthquake (TM-26) for u-s/m
As Olli said earlier in comments, ''It depends on what you want, Swablu/Altaria can be setup to do many things''.
In the end, depends on what team your building, altaria is also a mega Pokemon and can use z-moves in gen 7, so mix and swap moves.. its shown here on Pokemon db - Altaria and here on showdown (link supplied earlier as altaria set's) as combative