I don't understand what do you mean by "jagged". You would said that I must avoid the aliasing ? If it is what you want I can't really do it because of they're is no background.
Precise me if it isn't what you meant.
Awesome Sprite :) Well done!!, just do what piiichan said xD
She's pretty 
Pity the edges are a bit jagged on her legs...
it's better than most pokemon srites.