Voting Ferrothorn for #3
I realize that Genesect was one of the best overall OU Pokemon we've ever had, and it really effected the metagame quite a bit during its short stint in OU, but some of the voters here are only voting for it because it was broken. That's not the point of this thread. It's to showcase what Pokemon have had the greatest overall impact on the metagame. Did it create a new playstyle? Did it define a certain playstyle? Did it shape the metagame? Did it change the metagame significantly? No offence, I realize that Genesect did a few of these things and it was a very good Pokemon, but I don't think it makes much sense to put Genesect before something like Ninetales, who CREATED an entire playstyle and has made several lower tier Pokemon OU viable, while also forcing almost every team to run some kind of check/counter to the playstyle itself. I'm sorry, but Genesect did not have as much of an impact on the metagame as sun did. Yes it was overcentralzing, and yes it was amazing at everything, but it did not even have nearly as large as an impact as Ninetales, or heck, possibly even Excadrill. There's also one Pokemon that people seem to be overlooking, and that's who I'm voting for.
Ferrothorn IS BW OU defense. Without Ferrothorn, BW wouldn't be the same. It's the backbone of everything bulky, it's one of the best defensive Pokemon that Gamefreak has ever created. It can do almost anything for a team that needs it. Not only does it have incredible defensive capabilities, its typing only leaves it with two weaknesses, one being lessened when Ferrothorn is alongside Politoed. It can setup both Spikes and Stealth Rock. It's Steel-typing lets it wall a majority of Dragon-types that exist in the tier, especially when in the rain. Being Steel, it's immune to Toxic and Sandstorm, to very common forms of passive damage. Speaking of rain, its Grass-typing allows it to counter a large majority of rain offense, and it's often used on teams that struggle against it. It's also immune to Leech Seed, making it a nightmare for stall teams lacking some sort of Fire-type move. Ferrothorn is one of the sole reasons that every team is forced to run a Fighting-type, because it is very difficult to beat it without super effective damage. Honestly, I feel like a lot of people have already explained everything that I wanted to say about Ferrothorn, so I'll just end it here and say that Ferrothorn is one of the few things that is keeping the rain playstyle under control, and other offensive playstyle's as well, so keep that in mind. Genesect may have caused the tier to become more offensive, but Ferrothorn has caused the tier to become even MORE offensive in order to take it down. Genesect is not #3 in my opinion, but I will be voting for it again for a later rank.