Originally Posted by Fat SJCrew
I think Keldeo has enough checks and counters for comfort (though it doesn't help that between him and Tornadus-T, they can basically break through anything defensive). Tornadus-T and Thundurus-T, however, are neither easy to check nor counter. Two of those to a team, good luck. Prevent SR just once and you can probably keep your momentum the whole game.
Keldeo, when not using Choice Scarf, is actually very easy to check, as while pretty much nothing can safely switch on him, Keldeo can be easily revenge killed afterwards. However, its Choice Scarf set is the biggest problem. Is very hard to check, especially under rain. You must pack something that resist both of its STABs AND can defeat him. Or you must pack something that is a hard counter to Scarf Keldeo, such as Jellicent, Amoongus or Celebi. I am using the former, and it's actually the only reason why I use Jellicent as of now. Terrakion with Choice Scarf is also a little hard to deal with, but at least its STABs can be more easily walled and nothing can boost Stone Edge or Close Combat like rain can boost Hydro Pump/Surf... Also, Scarf Terrakion is weak to both Bullet Punch and Mach Punch, while Keldeo is resistant to Bullet Punch and Ice Shard, while being neutral to Mach Punch.