Roronoa Zoro said:
I think that Darkrai/Hydreigon, Rayquaza/Eel and Mewtwo/Zekrom/Eel are able to beat Keldeo/Blastoise, without much effort. And if Keldeo does get very popular and that good, people can just add Virizion EP + Eviolite to their Darkrai/Hydreigon deck to OHKO Keldeos while they need 5 Energys to OHKO it back. And I think the deck also will be very susceptible to N, but, it's pretty much theorymon. We can only see how good it will actually be once it is released.
P.S: This is my 1000th post! WOOT!
I think this deck will be really good though because Keldeo doesn't need a dark energy attached to him to go in for free like Darkrai, but the downside is also not being able to retreat from active for free and if they can at least hit for 90-100 with a basic Pokemon, they won't care if they lose one basic if they kill it because they win the prize trade and then a good amount of Keldeo's energy is gone just like that. The other problem that will happen with this deck is having to use so much energy to attack to the point that you'll have to use items to pool your energies back.
It will also be beneficial however to maybe throw in Mewtwo, Registeel, or Bouffalant into this deck. Great for Mewtwo because if you have just one DCE on him to start, even 2 waters hits for up to 80 if not more on T2 with the correct Blastoise build, 120 on most if you start with Bouffa with 3 energies, 110 with Keldeo, and 30 to possibly a couple things with Registeel, all of this as said can be done T2 with correct build. That's pretty scary if you ask me.
I think Landorus/other things/Dusknoir will be able to threaten it well though. Squirtle's ability doesn't stop damage counter MOVING(as it only stops dmg from attacks) so if you don't get Blastoise as fast as they get Dusknoir for whatever reason then a kill can be made from Landorus on a Squirtle if they get Dusknoir on T2. All in all though I think Boundaries Crossed will look to shake up the format a good bit more than we thought Dragons Exalted would as Gartaria and Garbodor decks proved to be quite underwhelming if you ask me.