Ok, so I'm just going to speak my mind here. Is there any way to counter or at least check this thing very well in ubers without doing something completely insane like running a choice scarf Mewtwo with fire blast? I honestly loathe the idea of having to stoop to choice scarf. I just hate using it. And before you ask, yes I see Genesect as more of a threat in ubers than OU because besides Mewtwo, Shaymin, Lugia and The Deoxys family, there isn't anything that can outspeed a choice scarf genesect with +1 speed. Nobody runs a scarf on the aforementioned Pokemon (Except for maybe shaymin, but I don't know much about how others use him) and for good reason: It's impractical as fuck for just about anything other than beating genesect at his own game. Smogon has a few "counters" listed for genesect but they're OU, firt of all, and second, it it tells you to use choice scarf users that are..well SUPPOSED to use choice scarf because they're actually effective choice scarf users in OU. No one in their right mind would put a choice scarf on fucking mewtwo because he is already fast and what makes people want to use him is his versatile movepool. I've never ever seen a scarfed mewtwo. I just think I should add that download makes up for it's terrible (by ubers standards) attacking stats. Another thing is that you can't sen out a bulky offense wall and hope to retaliate because it'll just be like LOL U TURN and switch out because your opponent already knows he can't kill you in one shot. So I ask you. Do I really have no alternative to sticking a scarf on a naturally faster pokemon?
I run HP Fire Giratina-o. It can survive the Ice Beam, though not too well... Ho-Oh takes the Ice Beam and force a switch if Genesect is scarfed.
Palkia is naturally faster than Genesect and is a good scarf user. Dialga is a good switch-in, since Genesect will struggle to 2hko it (particualry specially defensive variants). Ho-Oh can take everything Genesect throws at it except Thunder, and since you use Ho-Oh in the sun spamming Thunder becomes problematic for the Genesect user. Like Iceydude said, Arceus has the bulk to take on Genesect and use it as a setup opportunity. Good options include Calm Mind Fighting/Ghost (since they resist U-Turn). There are probably more options that I have forgotten about. Whilst Genesect is certainly better than some players give it credit for, it is not unbeatable by any stretch of the imagination.
Band Genesect is nowhere near as common as Scarfed Specialsect, but is just as deadly simply because you don't expect it. I used Band Genesect before it even got Iron Head and it was still amazing, +1 Banded U-Turn does stupid amounts of damage to switches and gives you a lot of momentum for offensive teams.
Bandsect's never, ever used in my experience. The way it works for me is that Dialga beats them 100% of the time. If they get an Atk boost I go to Giratina-O and if they use weak Ice Beam I go to EKiller and set up on its face. It, for me, doesn't have the required power for Ubers and now that the DoubleDragon/TTar metagame has rather quietened, it's even worse.
I appreicate your eforts guys but most of these suggestions don't really help. Like I said genesect will always U turn to something that counters what it can't kill and then I have to switchand then it will be a cylcle of crazy switching(in which genesect usually winds up winning in the end). That's what I was hoping to avoid. I do like the suggestion of bulky setup that T-dogg hinted at, though. I will try that.
Heatran works pretty well considering hardly any gene run up ground in ubers Dialga is in the same boat
Reshiram works well as a counter. 252SpAtk +1 Genesect (Neutral) Ice Beam vs 4HP/0SpDef Reshiram (Neutral): 36% - 43% (125 - 148 HP). Guaranteed 3HKO. 252SpAtk Choice Specs Turboblaze Reshiram (+SAtk) Blue Flare vs 4HP/0SpDef Genesect (Neutral): 571% - 673% (1624 - 1912 HP). Guaranteed OHKO. 252SpAtk Choice Specs Turboblaze Reshiram (+SAtk) Blue Flare in Rain vs 4HP/0SpDef Genesect (Neutral): 287% - 338% (816 - 960 HP). Guaranteed OHKO. It can safely switch in on Scarfsect (its most common set) and 1HKO with Blue Flare whatever the weather.
Genesect without U-Turn is really bad. If you're not using U-Turn then there are other things which will fill its role far better.
Don't use bandsect. It's bad. For ScarfSect, it really isn't that bad. Ho-oh hard walls it, Chansey and Blissey hard wall it, Heatran hard walls it, Dialga is pretty good with Fire Blast, Kyogres can take a hit a kill it. Hazards in general really can mess it up considering you'll probably not find Genesect with Forretress. To be honest, you shouldn't be having much problems with Genesect unless you're running offensive teams realying on Darkrai/Deoxys/Mewtwo.
Well, fuck. That's exactly what I do. It's my favorite playstyle. See this is why I hate choice scarf. It's like if you want to run offense you need scarfers or else you're screwed. Make me miss 3rd gen when having a naturally high speed stat mattered at lot more than it did now. Thanks everyone.
Not to rebump this, but like, what teammates are you running with those? because you don't need scarfers to beat Genesect. at all.
I find Arceus-Fighting is also a great check to Genesect, and defensive Dialga also works well. Standard Giratinas and Giratina-Os also barely take anything from Ice Beam. Genesect is really cool in ubers imo but not that hard to stop, unless like Manaphy said you're just spamming Darkrai/Mewtwo etc. I like running it alongside scarf Zekrom for lol volturn
HP Ground Sect for Heatran,Reshuram,Zekrom, And Dialga to be hit supper effectively. Uncommon but with +1 it can 3hko/2hko(with hazards) threats it cannot otherwise defeat. But, as Aurist said, Arceus Fighting is a reliable counter. This is the best Genescent check/counter in my opinion. Also, I ran it on A stall team with the only other offensive threat being RP Groudon. Worked wonders as an offensive Pivot / Momentum Steeler.
Yeahno HP Ground Gene is not going to be a realistic problem for any of you. I really like Zekrom and Genesect, but it's like impossible to fit a Spiker and a Spinner with that unless you like stacking Bug/Steels or Grass/Steel (Admittedly, you could probably get away with it if you have a well-built team!)