Why did Sheer Cold have no effect?

Question

I used Sheer Cold against Wingull and Floatzel after using Mind Reader to make it hit and it had no effect. Why?
Which other one-hit-ko attacks have no effect against certain types? The OHKO moves are Fissure, Horn Drill, Sheer Cold and Guillotine.

Answer 1

OHKO moves will fail if your opponent is a higher level than you.

But otherwise it can affect all pokemon types, unlike the other OHKO moves.

Comments

Thanks. That will be handy to remember its just I was wondering for my smeargle