People make keldeo seem better than it is.
Choiced sets are easy to wall, Ebelt set lacks the speed and power to get thru things. You realise when trying to sweep with Ebelt keldeo just how small its movepool is, as you will always be hardwalled by at least 2 or 3 pokemon that are
COMMON on all teams simply because you need something to tank Hydros, and those things that do just happen to wall keldeo pretty well.
For those claiming specs hydro hits hard, try analytic starmie then get back to me. More power, faster, better movepool, arguably better typing for sweeping. All starmie lacks over keldeo in that regard is bulk.
After lando-i was banned, everything that walled keldeo because more viable since they don't have to handle 2 things, or give it free turns (like in the case of 'croak with no ice punch). What pushed lando-i over the top was e-z button U-turn out to keep momentum while still being threatening as fuck.
Lets just get this test out of the way so we can get on with the real offenders.
Yea you hit the nail on the head here. Specs Hydro Pump under rain from a Keldeo obv hits like a girl xD.
In all seriousness, I think you are underrating Keldeo's power. True, Scarf its its most common set, and that lowers its attacking output, however under rain its effectively getting a 1.5x boost on its main STAB while obv getting the 1.5x boost to its speed holding a choice scarf. That already puts it head and shoulders power wise above most of OU. Expert Belt drops the speed advantage for greater usability of Hidden Power, with Dark and Bug being the more common options, although HP Psychic imo isn't bad for hitting Croaker / Cruel / various poison types etc. Icy Wind + HP Bug cripples its more common counters in Latias and Celebi encouraging players to look at other options such as Amoonguss since otherwise Keldeo is cleaning house. Its Specs set, while uncommon, is an utter bitch to switch into since, from personal experience, it just nukes everything.
Yea, you can change the weather and that lowers its damage output a bit, but no weather starter really likes switching into Keldeo in the first place (are you really sending in Tyranitar / Hippowdon on Keldeo?) so I dislike that being brought up.
Don't get me wrong, im not in any way arguing that Keldeo is uncounterable or impossible to handle, but on a practical level, you are very much underestimating the power of a Hydro Pump under rain (from 129 SpA), let alone one that's boosted by items such as Choice Specs, especially considering Water being one of the best offensive typings in the game.
Same thing could be said about terrakions CC when banded. Much of the same thing, given how much less prevalent physical walls are. Gliscor, Slowbro and Lando-T are the only pokes that can really switch into CC with impunity.
I think people will find that keldeo is far easier to combat that Lando-I.
You have to remember that the big reason for running HP bug keldeo was to get celebi out of the way FOR lando-i to sweep, not necessarily for keldeo to sweep. HP bug keldeo is pretty darn easy to wall, and Icy wind really hits like a feather.
Remember if you are going to argue about keldeo rain boosted hydros, we arent including ttar in the mix. This means that pokes like jellicent, slowking (meh why not), Lati@s, starmie, etc all have a much easier time switching in; they need not fear an impossible to break pursuit trap.
People will start running Toed+Keldeo+Scizor quite frequently I'm sure, but scizor's not completely immune to prediction like ttar was.
Random nitpick, ghost > dark simply because it hits croak, and won't give out justified boosts.