The Celesteela set looks pretty cool. It seems fairly dependent on setting up in order to actually do some damage, but I still like the idea of it. I don't really understand why you included the calc against Primal Groudon, though. I don't think most people would be switching in their Pdon to a Celesteela that just used Shell Smash. I guess you could bluff Flash Fire by bringing Celesteela to face Pdon off a slow pivot, but Celesteela still fears Bolt Strike and Thousand Arrows. But the set looks neat and I'd like to see it in use to see what kind of damage it can actually do outside of theorymonning.
But I don't really understand the Yveltal set. Imprison is extremely niche and takes up a valuable moveslot and a turn. You claim to block Triage, which can only be true if you've had a chance to set Imprison. It is definitely not switching into a boosted Triage user's attacks and no Triage user is being sent in to face an Imprison + Oblivion Wing Yveltal. Otherwise, it is slower than a relevant Triage user, Mega Charizard Y, by one point in base speed and is 2HKO'd by its Fire STAB (calc below).
You are also taking away from one of the main reasons to use Yveltal in BH, which is its Dark-type STAB. Your set is one of the rare Yveltal sets that is walled by Normalize Gengar and Aegislash. Revelation Dance looks like it is really missed on this set. Revelation Dance also 2HKO's Giratina and can't be removed due to Core Enforcer like Boomburst can. I just can't see this guy having many opportunities to fully setup while also staying healthy and avoiding things like Spectral Thief or ability removal.
252+ SpA Life Orb Charizard-Mega-Y Blue Flare vs. 252 HP / 252 SpD Yveltal: 282-333 (61.8 - 73%) -- guaranteed 2HKO
252+ SpA Life Orb Yveltal Revelation Dance vs. 252 HP / 252 SpD Giratina: 296-351 (58.7 - 69.6%) -- guaranteed 2HKO
I think of it as you switch in Celesteela against something it walls; it fears Anchor Shot and switches to PDon with Bolt Strike. You Shell Smash on their switch - which catches them off guard.
From here, they get 1HKOed if they think they can survive your Sunsteel and KO back with Bolt Strike, only to get 1 Shotted.
Same goes if they switch Groudon out after it comes in on a Smash, realizing Celesteela is not defensive, and then go to a Prankster Registeel who now gets 1HKOed by Precipice Blades on it’s switch in.
Basically, you don’t come in Vs Groudon. Since I feel it lures in Pokemon like Groudon, I let them switch into Celesteela, which forces them into a 1HKO, or forces them out to get KOed themselves.
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Yveltal also functions as a lure, attracting Imposter to switch in as it Imprisons, Boomburst can handle Giratina off of a a harder hit, and yes it does fear Spectral Thief and Core Enforcer, but typical the only faster offensive threat with Spectral is MMX who fears Boomburst, and if it doesn’t know the set, likely fears Oblivion Wing once I used Tail Glow (believing it’s Triage).
Yveltal usually does pretty well Vs MMX.
As for Core Enforcer, most users are slower, letting Yveltal go first with Boomburst, so things like Tina, Zygarde-Complete, etc. are hit harder before removing its ability.
Oblivion Wing isn’t just for Triage users, but many Triage users will use it.
I see your point on Charizard-Mega-Y, but if your team has SRocks up, takes 50% in the switch in, Charizard isn’t going to last, and now cannot heal or Set up.
It will be pointless to send it in after taking SR, and then switch out (say it comes in on Imprison), so it will also take 10% off of the Life Orb once it attacks with Blue Flare, and then takes STAB Oblivion Wing off of Yveltal,
252+ SpA Life Orb Yveltal Oblivion Wing vs. 252 HP / 252 SpD Charizard-Mega-Y: 136-161 (37.7 - 44.7%) -- 68.8% chance to OHKO (40% remaining HP on Charizard).
Otherwise, Charizard coming in on Tail Glow (even without Stealth Rocks), will yield a 1HKO off of Yveltal’s Oblivion Wing 37.7 x 2.5 = 113% damage
Further, when people see Yveltal set up Tail Glow they predict Triage. Which means they are likely to send in a Dazzling Pokemon, only to get hit on their switch in, or an Unaware Mon like Zygarde-Complete which will be outspeed and Boombursted.
Prankster users are something they will want to slow pivot in because they assume Triage will let me hit them on their switch and outspeed their Haze next turn. Plus they want to avoid sending in Prankster Tina in the first place because they fear Revelation Dance, and Boomburst does even more.
Giratina
252+ SpA Life Orb Pixilate Yveltal Boomburst vs. 252 HP / 252 SpD Giratina: 367-434 (72.8 - 86.1%) -- guaranteed 2HKO after Leftovers recovery
Zygarde-Complete:
252+ SpA Life Orb Pixilate Yveltal Boomburst vs. 252 HP / 252+ SpD Zygarde-Complete: 393-463 (61.7 - 72.7%) -- guaranteed 2HKO after Leftovers recovery
Obviously Yveltal won’t switch into set uppers, it will lure them and walls in. Tail Glow suggests it’s Triage, so they oftentimes switch out what they send in on the turn I Tail Glow, or they slow pivot to an Unaware or Prankster user, only to get Boombursted.
What makes it a lure is that with Ray gone, it will be able to bluff Triage, or even bluff Aerilate. As when they see me hit nuetrally off Boomburst, they send in a Tar to take the “Flying” Boomburst, resisting Moongeist Beam or Revelation Dance (if they think Tar is an overall safe switch in to its other assumed moves) only to be hit by a Fairy Boomburst. Outspeed by Yveltal barring a resisted Sucker Punch, their “check” is now handled.
252+ SpA Life Orb Pixilate Yveltal Boomburst vs. 252 HP / 252 SpD Tyranitar-Mega: 367-434 (90.8 - 107.4%) -- 43.8% chance to OHKO
I’ll get some replays, but the uniqueness of Yveltal is people don’t know what to expect because they assume Defensive sets like Unaware or RegenVest oftentimes on team preview, (like if I predict they will send in Diancie Vs it, I use Imprison), or offensive sets like Triage once they see Tail Glow, or Aerilate once they see Boomburst.
If I had a Charizard-Mega-Y and I see that Yveltal has Tail Glow, I would assume Yveltal was Triage until proven otherwise, and be hesistant to send Charizard-Mega-Y in. Because if I switched in Charizard on Tail Glow (even on a slow pivot) I would assume Oblivion Wing is coming off of priority, and fear being one shotted.
Why not just, send in a Prankster or Unaware mon instead? Then Boomburst hits them on the following turn, and even “safe checks to Triage” like Unaware Yveltal / Zygarde-Complete are threatened by Boomburst, which is something Revelation Dance cannot do.
At the very least, based on my experience using it.
Still, I see where you are coming from.
