i cant tell you exactly... but here are some websites for you.
www.serebii.net or www.psypokes.com !
omanyte evolves at level 40.
Omanyte evolves at Level 40.
Omanyte evolves at level 40.
At level 40, Omanyte evolves into Omastar.
Omanyte evolves at level 40.
it doesnt evlove by level. you need to trade it and it will evlove for them, then they trade it back.
Omanyte evolves into Omastar at level 40.
Level 28.
Level 36.
Level 25.
Omanyte evolves into Omastar at level 40.
Level 40.