Deoxys-N I am mentioning solely because of its massive mixed bulk but it can't do shit to even the frailest of glass cannons and so slow that it can't really do anything at all. Then again, with this philosophy, Deoxys-A should be unbanned right now because it can't take a hit even with 50/180/180 bulk. Because of that base 50 HP, that base 180 defenses don't mean much.
It's super Standard Deoxys Defense. Why on Earth would we unban it, unless we decide the rest of the meta's central threats are good enough to overcome its awesomeness.
Deoxys-D still provides really good hazard support, even though it lost a little bulk (160/50/50 isn't that much worse than 50/160/160).
252 Atk Tyranitar Crunch vs. 252 HP / 4 Def Deoxys-D: 180-212 (59.2 - 69.7%) -- guaranteed 2HKO after sandstorm damage
Standard Deoxys Defense being attacked by Standard Tyranitar.
252 Atk Tyranitar Crunch vs. 0 HP / 252 Def Deoxys-D: 318-374 (68.9 - 81.1%) -- guaranteed 2HKO after sandstorm damage
Stat Switch Deoxys Defense being attacked by Standard Tyranitar. Its low roll damage is slightly lower than the previous high roll damage. It's noticeably worse.
Mega Kangaskhan I've already argued should be unbanned -and that was
before I knew it has like a third the HP. If it's "broken" in this meta I will be
amazed and want to unban it
just to see it happen. More likely it will be such garbage nobody uses it, or very niche in its utility. Remember all those calcs I made showing the Regis do severe damage to it? I did those with it having its normal 100 HP. Take an 80% health hit and just assume it's a OHKO.
Darkrai I suspect is still Uber. It would be nice to unban it, and I'm for
tentatively unbanning it to test if it's still broken or not, but I won't be surprised if it's just a different flavor of Uber.
Skymin is, to my understanding, Uber primarily because of its flinch-hax, which is crippled with a base Speed of 75. If I'm wrong and it's Uber primarily for a bunch of other reasons, than I guess it shouldn't be unbanned -but overall I'm for unbanning it.
Aegislash sucks and should be unbanned. It can't attack effectively (But its Imposters can), and if it wants to use its bulk it needs to open with something like Shadow Sneak to force it into its bulky Blade Forme before it gets attacked, which is like a dead move slot. Don't even
think of switching in, and King's Shield is now a very dubious move. I'm not sure what use it will even
have.
Genesect is much less aggressive, which makes its access to Extreme Speed and powerful attacking moves less useful. Trading for HP gives it more bulk, so it's more likely to survive attacks, but it's not actually a good set-up attacker if you're not in STABmons, and it's not really got the movepool to wall. Overall it's basically just worse at what it does. Is it merely OU material? I'd like to find out: unban at least temporarily is my opinion.
Rayquaza I'd be hesitant to unban. Regular Rayquaza ends up
quite the wall, and then Mega Rayquaze (Which can admittedly remain banned) gets an Ability that
helps it wall. To be fair, Rayquaza can't heal itself... I guess it might be worth test-unbanning it...
Kyurem White is Standard Kyurem Black, only trying to pretend to itself it can wall instead of using its monster Attack to be useful. That is, Kyurem White doesn't
have monster Attack. And it doesn't have Pressure like regular Kyurem to actually be
good at stall. So I'm pretty sure unbanning it works.