I had a much more well written post than this, but Microsoft Word decided to crash on me and I'm really pissed off. You must know how it feels when you put a lot of effort into a post and have to do it all again from scratch, it's never the same. So take that into account when reading this, I guess.. :(
I feel that this strategy is very clever, very annoying, but clever none the less. Everyone's coming up with ways to stop it, mainly involving our "trusted" walls changing what they do slightly to counter this "new threat". But honestly, would they be doing what they're meant to do as effectively if they had to worry about Wobbuffet as well? I personally believe Wobbuffet can be more threatening than the aformentioned Dgutrio & Magnezone (as stated by Obi). The reason is simple, you can trap everything and lock them into an attack, this works against basically everything not using a boosted attack, or rather powerful super effective attack, but you're usually going to have a counter to them if using Wobbuffet, right?
I see a lot more Thunder Wave Blissey than Toxic Blissey, I know you, Obi, love to use Toxic Blissey more often. But most people opt for Thunder Wave to hopefully slow down incoming physical attackers. If Wobbuffet comes in on Thunder Wave, there's a high chance you're going to be locked into Thunder Wave after the Encore. Since everyone else is being very situational as usual, I'll say Wobbuffet is holding a Lum Berry in order to escape that occasionally hindering Sleep or Paralysis, or even Poison status. If you want to paralyse this Wobbuffet, go ahead and get encored. That's perfect bait for a Dugtrio switch in, while you're locked into Encore. Dugtrio not having to worry about that Ice Beam, or whatever other attacking moves you have anymore. You can argue that Dugtrio could just switch in on its own to beat Blissey, but that usually requires weakening it substantially first. Having it locked into Thunder Wave would be an added bonus. Blissey can switch against anything else that uses Encore, but not Wobbuffet. This might seem like a lot of effort, but if you think about it,, isn't it less effort than having your whole team collectively focusing on ridding of that special walls HP enough so Dugtrio can pick it off for a sweep with a special attacker? Don't get me wrong, but I think that's a lot cheaper than having to work hard to pull of your sweep or rid of a problem Pokémon.
This list posted by user "the artic one" confused me, just a little:
skarmory - just use a shed shell, then you won't fear magnezone either
bliss - toxic/sing
bronzong - hypnosis, could be using a shed shell
celebi - either has baton pass to escape or leech seed to drain wobba
cresselia - why would you bother with wobba instead of going straight to the cb pursuiter?
dusknoir- shadow sneak means he can't be outsped, also if wobba comes in on pain split he'll lose a huge chunk of hp.
forretress- might use a shed shell to escape magnezone anyway, can explode on wobba if he outspeeds.
gliscor- taunt or baton pass
hippowdon- yawn (if he predicts)
Jirachi - has u-turn
magnezone - will probably lose to this, does hit from the special side though
milotic- hypnosis
starmie - surf surf surf
tentacruel - see starmie
swampert -see starmie
vaporeon - blah blah
Now then, Skarmory has been explained already. Occasionally people will use a Shed Shell so they can definately get Spikes and/or Stealth Rock down. However, I feel that the majority of the time Skarmory is the physical wall first, and the spiker second. Thus it will want Leftovers more often than Shed Shell. Too much empahasis is being made on Shed Shell, I'd like to stay away from it really. Blissey, IMO, wants to use Thunder Wave a little more often than Toxic or Sing, nor does it want to use a bit of a Speed investment. Bronzong can threaten with Hypnosis, but if Wobbuffet comes in on any other attack, which is likely, you're done. Celebi is likely to escape if it's a baton passer varient, but I've actually seen less passers these days, and generally see few U-turners, but I'd imagine they're more common than I thought. I don't think Wobbuffet is a great switch in to Celebi, though. With Cresselia, you can at least scout its moveset easier, but you are better off switching straight to your Pursuiter. Dusknoir would match up okay. Forretress is just as bad as Skarmory really, and I wouldn't want to use Shed Shell for the same reason as Skarmory. Plus the fact it lacks a recovery move. Gliscor using Taunt or Baton Pass isn't as common as the general physical wall set, but it's safe if it is using either attack, but that means it's not a wall, it's a baton passer. Hippowdon doesn't want to have to have Yawn all the time to deal with Wobbuffet, and once you've put something else to sleep you can't do it anymore. Jirachi does generally have U-turn so you'll be okay more often than not. Again with Milotic, once your Sleep is used up Wobbuffet would have a bit of fun with you. But if you get the Sleep in on a none Lum Berry version, fair enough. Everything else is pretty laughable, or are you completely forgetting Wobbuffet has Mirror Coat and Counter?
Anyway, Wobbuffet should stay Uber IMO. I might go as far to say it's something that's more annoying than "broken", but I still think it's broken and support it being banished to the Uber tier completely.