Trying to do too much in one moveset. Use Yawn to stall out for Curse, then, with Attack and Defense Boosts, attack with Waterfall or Ice beam.
If Magnemite comes in, you're screwed. You need more coverage.
Yawn is useless in a fast-paced league like Little Cup. Use this for another attacking move.
All attacks should be Physical, meaning to take Ice beam out of there.
You've got a great concept, but just work on it a bit.
