it evolve on level twenty two in emerald
Taillow evolves at level 22.
Train Taillow to level 22
Taillow evolves at Level 22.
at level 36
i think at level 32
Taillow cannot learn Brave Bird. To teach Brave Bird you need to breed Taillow.
at level 22.
Level 23. 
level 22
At level 22 it evolves into Swellow.
level 40
Level 30.