Raikou for #9, Blissey for #10 is my opinion atm. Raikou is top 3 in GSC, can't leave something like that out of this list. Blissey, on the other hand, has always had a constant presence, at least starting in ADV, that forced offenses to plan around it. In GSC it doesn't really matter since Snorlax, Raikou, and Miltank are everywhere anyway, but ADV onward it definitely shapes the metagame. Sorry Forry/Cloy, your Spikes are nice but you're not that great.