For Eggy, I think it’s a no brainer... Confusion is clearly superior to ES and ZH.
For Alakazam and Mewtwo, it really depends on your play style. If you like dodging and charge your special attack very fast, go with PC, if it’s all about DPS without dodging, Confusion is what you want. But honestly Alakazam and even Mewtwo are pretty fragile so I think you want to charge your FS or SB as fast as you can and dodge as much as possible so PC seems to be clearly the optimal choice ;-)