Here's my opinion:
1. Machamp
2. Yanmega
3. Gengar
4. Mew
5. Absol
6. Celebi
7. Magnezone
8. Electrode
Machamp and Yanmega have the most potential to be main attackers in there own decks. Gengar prime is a decent tech in Gengar decks. I think Mew is a pretty good card, and we may see it in our metagame soon, I just don't know how it will be used. Absol's only purposes are, being paired with Mew prime, or a Gengar counter. I think Celebi's pokepower is decent, but for it to be higher on my list it has to prove itself first. Magnezones pokepower isn't that great, you're better of using starter pokemon like Spiritomb and Sableye in stage 2 decks. Electrode is definitely the worst of all these primes, not much else to say, but it's just plain bad.