Im stuck in the sand temple.
On curly.
The boss of curly.
FFFFFFFFFFFFFFFFFFFFUUUUUUUUU UUUUUUUUUUUU-
You are fighting curly? Use level 3 fireball (any level works fine), she never jumps and it'll stun the mimiga too. Also don't jump unless you have to to avoid damage otherwise you'll get hit more often than necessary. The mimiga's are just there to distract you from Curly so just keep shooting fireballs at her and you'll win. Note: she blocks missiles so don't bother.
If you are talking about Omega just spam fireballs at him too, missiles also wont work on him untill he starts jumping.
Spoiler Edit: Don't take her Machine Gun unless you really, really, want it. You can get better things for your polar star later.