Assuming we're including ubers, definitely speed boost blaziken. There's a reason why he went to ubers, while the others didn't. However, i'm going to assume changing the game will stick to the B/W OU metagame, so then i'd say politoed
Magic Bounce Espeon
Speed Boost Blaziken
Poison Heal Gliscor
Magic Guard Alakazam
I love Gliscor w/ Poison Heal. It's just perfect for toxic-ing the opponent and stalling them out with Substitute and Protect.
Mankey, Pancham, Riolu
My favourite pokemon of the dream world are: Dragonite(multiscale), Lucario(justifed) and Blaziken(Speed Boost).
Politaod and Ninetails made the biggest impact on the metagame, but my fave is Dnite, toxic heal gliscor
I think I would say Speed Boost Blaziken.
Speed Boost Blaziken! Now if I could just get my hands on one...
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Seriously, EgoRaptor said everyone still uses Blaziken. Warning contains very foul language.
with the release of b/w2, i believe several key pokemon should be included, 2 very important ones:
and shadow tag gothitelle
along with regenerator ho-oh, and multiscale lugia,
Eh, I'll go with Drizzle Toed. I know Politoed hasn't been great these past four Gens, at least they gave it a good ability to it.
Whereas Blaziken, was Smogon aware that it was overpowered in the OU metagame?
Man, Hydration Vaporeon gets no love.
As not-metagame-big-or-important Vaporeon is, it still maintains a humongous niche in Rain as either going two ways: A ridiculously Bulky Special tank that gets an auto-Refresh every turn in Rain as well as free 99% recovery or a surprisingly strong Tank that can abuse the hell out of Life Orb + Rest. The biggest detriment to all of this is the very small existing number of Rain stall teams that require it. Based off of August statistics, the metagame is split in half in terms of Stalliness, so Rain stall makes up around 10% of the metagame, and most of the denizens on the Rain Stall are Poli/Tenta/Ferro/Bliss/Glis/Filler. Vaporeon has to compete heavily for that one spot on the team. While it is bulky, it can't take Spec Meteors all day, so Blissey/Jirachi still stands. Tentacruel has too many benefits over Vaporeon, as Tentacruel can take Toxics, set up hazards, spin, and recover 12.5% every turn in rain, whereas Vaporeon just takes status and not wall much.
Why am I arguing with myself? Friggin' 1 A.M.
Oh, and Flareon should get Kudos, too, for finally getting Guts. Although it's still crap and Guts is still a crap way to boost your Attack, it still fires off pretty strong Superpowers and gives Fire Fang more bite (no pun intended).
heracross got even better with moxie, as did gyarados.
Dumah (Gothitelle) (F) @ Leftovers
Trait: Shadow Tag
EVs: 252 HP / 160 Def / 96 Spd
Timid Nature (+Spd, -Atk)
It hasn't affected any metagames yet, but soon this thing shall make make all stall pokemon with only one move (ferrothron,skarmory, countless UU and RU pokemon) die of struggle while it simply mocks them, and make choiced pokes using Hidden Power or close combat break down in tears. It almost certainly breaks UU, even though its crap in RU, because it can destroy things like most snorlax, and the common CM/rest/sleeptalk/scald suicune. It's only weakness is that torment works differentally on pokemon showdown than on Pokemon Online(it still kills them, but you actually have to use protect). And naturally it kills the common scarf heracross/terrakion.
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Even though Drought Tales and DrizzleToed have become very famous for their weather abilities, I'd have to say that my favorite one would be Magic Bounce Espeon, Sending back any entry hazards or status attacks is just plain Awesome
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ditto and ninetales. sunny day makes fire type moves more power this will help so much,they're weak compared to arcanine.straightaway solar beams for water,rock,and ground types that have the advantage
For the Battle Subway and PWT: Truant Durant.
1) Use Entrainment.
2) Switch out to a Baton Passer like Smeargle.
3) Set up Shift Gear or Quiver Dance or any set up move you have while using Protect on the attacking turns of Truant.
4) Use Substitute when the opponent can't move then Protect next turn
5) Baton Pass to the Sweeper of your choice.
The only Lead Pokemon for the Leaders and Champions that has anything to counter Entrainment Durant is Brock's Onix with Protect in the Kanto Leaders Tournament but even with that, unless he uses it every other turn, you got nothing to worry about (It's only attacking move is Sand Tomb). Plus the AI is stupid enough to not switch out when it gets Truant.
I've never used it before but I really do want to try it out.
I personally think Regen Torn-T deserves a mention. Although it isn't used in every team it still has changed the way BW2 OU Players make there rain teams and others as well.
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I personally like regenerator slowbro. I know it's not OU, but regenerator makes a good wall even better.