Just a few things.Uhh..........it's about latias/[insert check/counter here] switching in and the keldeo user predicting on THAT TURN. That's when it's effective. Now what I've seen is that a lot of people glorify pursuit trapping as something easy to do. It's kind of funny. I'll list a few off the top of my head: reflect type has become a thing on latias, latios(shaky check to pony but still) can muscle through weakened and banded ttar, celebi just BP's, jellicent will-o's, slowking can decide to slack off stall in case of pursuit or fish for a scald burn on a switch(unreliable but so is ttar, which is what I'm trying to prove) and amoonguss just doesn't give a fuck. I'm not sure why this hasn't(to my knowledge) been brought before, but the metagame adapts to itself. This can be seen in HP bug ebelt keldeo, lures, blah blah blah, etc. As far as I can see after lando's banning, it has been doing that well with pony. I wasn't there during the tornadus-t and genesect era, so I won't bother with that, but I assume it could not adapt well and it just made it extremely unbalanced(correct me if i'm wrong). So overall, I don't see why keldeo should be banned. It has its checks and counters in place and imo the metagame is pretty good now, even if it isn't, we are talking about the pokemon in itself, and not a perfect metagame. Sooooooo no tl;drs, read through that.
- Pursuit trapping isn't that hard if you're using ScarfTar, as it outspeeds Latias and Celebi; granted, because of the power loss, you start the whole 'Crunch-versus-Pursuit' mindgames, but it puts a lot of pressure on the defensive player regardless.
- Reflect-Type is only a 'thing' because of Pursuit in the first place, and it takes up a valuable moveslot that could've gone to HP Fire, Psyshock, Surf, or Sub depending on what set you're running. Soooo eh. I feel there are better ways of beating Keldeo + Ttar than Reflect Type in any case.
- Celebi can only reliably BP out of a CB Tar; It gets in a lot more trouble against Scarf Tar.
- Jellicent is good. The only comment I would make is that WoW is prone to missing at the worst times, but what can you do :/
- Slowking really isn't good in OU. If I felt that I had to run Slowking to beat Keldeo, then I'd be voting ban for sure. Fortunately I don't think that, but the whole Slowking thing should really be self-evident.
- Amoonguss is OK too, but it is unfortunately massive set-up fodder once Sleep Clause is activated. That's a problem in a meta that's so offensive; if you're going to run stall at all, you have to play it aggressively, if that makes sense. Amoonguss fails at that.
And yes, Tornadus-T and Genesect were utterly stupid, and ridiculously easy to spam. I know I got reqs at least once pretty much by just spamming Hurricane on the ladder.
As for what this all means regarding Keldeo: the answer is kind of ehhhhhhh. It's pretty hard to handle at times, that's for sure, but I'm still not 100% convinced it's broken. Probably not going to go into all the detail too much, I think most things have been said by now.