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: Yes, Mega Pinsir is OU worthy, but this type combination is locked behind a Mega Evolution when it comes to OU. A normal Pokémon with this typing might be difficult to balance, but having Magic Guard to counter Stealth Rock might work. An Aerilate Pokémon with this typing but instead Special oriented can also works.
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: Mega Beedrill is UU which is closest to OU, but that is not good enough. A more defensive Bug/Poison Pokémon might work better, but making it more offensive (threatening both Fairy and Dark) similarly to Mega Beedrill can also work.
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: It was used by Nincada, but alas it evolved into either Bug/Flying and Bug/Ghost, the latter being interesting but locked behind Shedinja, which is a one-hit wonder and difficult to balance because of Wonder Guard. It have potential of great offensive presence.
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: With Armaldo out of picture and Shuckle yet to be buffed, this typing might work well as either offensive or defensive.
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: Pheromosa is banned from OU, and Buzzwole and Mega Heracross aren't viable enough to be fully OU. It have great offensive presence but crippling weak to Flying. We had to make sure we will not make the next Pokémon with this typing too powerful or dangerous like what happened to Pheromosa.
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: Okay, quite unorthodox and double weakness of Fighting, but it is also immune to both Psychic and Ghost, which in turn have a potential STAB for both Knock Off and Return/Extreme Speed.
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: Those that have this type is either below OU (Honchkrow), banned from OU (Yveltal) or not this type in here anymore (Mandibuzz). It have physical threat potential, being able to threaten both Psychic and Fighting.
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: Have a potential to threaten Steel-type while also able to fight back against most Psychic-type.
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: Vanilla Wigglytuff is weak even in PU; now it is a deadly threat with Fairy/Flying and even better Abilities, insane Sp.A stat and three useful moves when used right. Mega Audino is an NU Mega so don't count on this one. With this one out of picture, Fairy + Normal still have the potential of what Wigglytuff could if it wasn't for awful BST: A Pokémon with a very large moveset like a Normal-type and the efficiency of the Fairy-type.
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: Have great potential, but Ribombee isn't strong enough to pull its weight. Making it better or find a more suiting Pokémon would be nice.
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: Blaziken (both normal and Mega) is banned from OU, and Infernape cannot caught up in OU well. Emboar is now Fire/Rock so don't mind him. This have great offensive potential, but we had to make sure that it will fit in OU without getting too ridiculous. Maybe nerfing the base Blaziken by replacing Speed Boost by something else and some few other adjustment will do it?
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: A good Fighting typing that have no worries of both Psychic and Fairy does to taking neutral to them, but Cobalion remains in OU while Mega Lucario is both Mega-locked and banned from OU.
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: Marshadow had been proven too threatening in OU, but I think a more Special oriented or an oddly more bulky one might work well without going overboard.
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: This one would work better as a Special sweeper unless if you can prove me otherwise. Ghost/Grass is not really that good of a defensive typing does to five weaknesses.
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: Now with Torterra is out of picture, I'd like to think that this one works better for a fast sweeper does to only two resistance and one immunity, compared to three weaknesses and a double weakness to Ice.
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: Have potential of either physical or special sweeper, and a nice immunity to three types. None of the actual Ground/Ghost can pull their weight well in OU.
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: Works better as a sweeper, since Ice is a bad defensive typing thus weight down Water's resistances.
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: Jynx is now Ice/Ghost (while Froslass is Ice/Poison in here beforehand), and it have powerful Special sweeper potential.
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: Horrid double weakness to Fighting, but being able to be on either Sand team or Hail team would help a lot and make it unpredictable.
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: Could work in OU but Aegislash was proven too much and sadly, it got banned. A more reasonable Steel/Ghost will be nice for OU.
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: None of the Water/Rock Pokémon are viable to OU. A crippling 4x weakness to Grass discourage a defensive Pokémon unless if you dare to give it Sap Sipper, and even so I would personally find it better suited to offensive.