mine evolved on level 22 i raised it since like level 2 so ya
i think at level 32
Taillow evolves into Swellow at level 22 and does not evolve further. Swellow should always know Fly and Steel Wing.
I am sure that taillow can only learn steel wing if you use a TM
tailow evolves on level 22 to swellow which if people think he can evolve he cant so stop trying ya dingbats
He evolve at level 36 your welcome
Train Taillow to level 22
Taillow evolves at level 22.
Taillow evolves at Level 22.
A Taillow will evolve arounde level 22.
level 22
at level 22.
Level 23. 
level 22
At level 22 it evolves into Swellow.
i think at level 32
It evolves into swellow at level 22
level 22