Well, Mightyena doesn't evolve, but Poochyena, its former evolution does. Poochyena evolves to Mightyena at level 18.
Mightyena an Lv.18
it evolves to mightyena at level 26
level 40
Level 30.
Level 32.
level 26 ^^
Level 16
On level 20.
Level 16.
At level 59
at level 32
it will evovle at level forty-five