With PvP, (and assuming same battle mechanics as now) are we doing to have to either rebuild the attacker tier list, or will there be a sort of PvP only attacker tier list (actualy, im not sure attacker is the right word as both pokemon are attacking and defending, but I dont know what to say other than maybe just PvP tier list?) Mostly as a few top tier attacker, while fantastic for raids and gyms, dont really have the bulk to handle te kind of game PvP will be. Like machamp is great at killing blissey in gyms, but its survivability isnt that stellar for the type of game mode PvP likely would be (given what the main series pvp is) mostly as it requires dodging in most instances to one for one a blissey, or electivire vs kyogre, yeah it has high DPS than raikou, but not the same survivability. I think this part of the game, at least from what the main seires has and how typical PvP works, will be more about TDO than DPS than the rest of the meta is
Also, how well does blissey do now with the CP rebalance and Meteor mash metagross being a thing now?
Probably a separate PvP list, assuming the it deviates from the current raid and gym formulas. It's all a big question mark at the moment.
If the timer is eliminated, for example, then TDO will probably be more important than DPS. If both parties are active participants, then dodging becomes more important, so pokemon/moves that favour that may be ranked higher.
Also, fast attacks like Stone Edge will be more useful that slow stuff that does more damage. Would you rather do 100 with a Stone Edge, or 180 / 4 = 45 with a dodged Solar Beam? Ease of dodging now becomes very important - it has always been an issue in Gym Defense, but not one that many people paid attention to.
All good things with time.
The most that's known about PvP is "it's on the way". You mention noteworthy points, but their weight on PvP is unknown until the mechanics become known... after which testing/sampling is required to truly devise a tier list.
You've pretty much answered your own question regarding Blissey. She was hurt by the CP rebalance, and MM Metagross is a DPS beast that safely resists all of Blissey's movesets. Assuming that most players have at least a couple of MM Metagross, everyone has a guaranteed answer to Blissey... I would not recommend using her.
