Shaymin-Sky just needs to be coupled with something like Scarfed Jirachi to get the flinch-hax going, as Throbulator pointed out, and it throws in a devastating Seed Flare as an option to boot, and has coverage in the form of Earth Power, making it
extremely difficult to bring in something it can't really touch. (Bronzong is one of the only things that isn't impressed by Shaymin-Sky)
Regular Blaziken is, yeah, arguably a bad Infernape, especially since Infernape's Iron Fist, though weak, is a lot more relevant since it boosts Mach Punch, Thunderpunch, etc, while Speed Boost is only useful if Blaziken deliberately stalls with Protect to pull ahead of something in specific, or otherwise ends up not switching for a turn. Mega Blaziken could be worth a shot, anyway.
Mulan15262 said:
While it can't keep pokemon in with Shadow Tag, it will still keep you from manually switching through Shadow Tag, outspeed you with its base 130 speed, and then destroy you with its base 170 special attack.
If you're trying to manually switch in Volturn, you're generally doing something wrong/in trouble anyway. (Especially now that Fake Out is capped) And certainly it's fast and hard-hitting, but it got banned to Ubers in part because it could go both the "smack things and they die" route
and just trap something and Perish Song it away, which is considerably harder when anything that pokes it will switch out and ignore the counter. (Basically
most Eviolite Chansey builds are screwed, since Toxic and Seismic Toss are often their only moves for triggering the switch, and neither works on Mega Gengar -but then there's Thunder Wave Chansey)
It's also still vulnerable to Sucker Punch, has weak defenses in general, lacks healing, doesn't resist Stealth Rock, and can't even carry Leftovers. Furthermore, from the perspective of stall, trying to trap doesn't work so well when Roar and Whirlwind go through Protect
and give the shuffler a switch into whatever they feel like, in response to your random switch.
I'd rather see it unbanned and actually tested than just assume it's still broken, given how much its core strengths suffer. Being fast and hard hitting isn't everything in Volturn, bizarrely enough, and carrying Mega Gengar means you're not carrying some other Mega, some of which have already proven to be
very good in Volturn.
I am curious as to the possibility of unbanning Mega Salamence. It can't setup and sweep like crazy since the first time it hits something it'll switch, but it's still going to be obnoxiously hard hitting and have perfect coverage for its primary attack, and arguably it can just drop Dragon Dance for Roost, freeing up the rest of its movepool to be something like Return/Earthquake/Fire Blast, so I'm not sure myself, but it's the main other Uber that seems
possible to unban.