I've already told you a few things on the sim with your previous, very similar version, but let me reiterate them.
I have no complaints about the Hoopa-Unbound set as it's pretty much one of the sets I run and know succeeds once it gets a smash up. My one complaint is Shed Shell. What unearthly reason is there to run this? Unless you mean Shell Bell, which is
worse.
Swampert-Mega isn't that good in this metagame. Skill Link Water Shuriken/Bone Rush looks nice on paper but isn't actually that good in practice. There are plenty of other Physical Water types out there that can probably do Swampert-Mega's job better. As stated earlier, Skill Link looks nice on paper but isn't that good in practice, so you should probably run something else.
Toxic isn't the best status move to throw about in BH with Poison Heal being Poison Heal.
Milk Drink is superior to Recover. Since I notice you have no Soundproofs on your team, Heal Bell can be used over Aromatherapy, but you do not have to use it. Giratina's a good pokemon, and this is a decent set, but the set could easily be changed to deal with your team's flaws.
MMY is probably better as a Protean abuser than a No Guard abuser. If you absolutely want No Guard, don't run Blizzard and Sludge Wave. I also noticed, and pointed this out to you, that if an Imposter switches in something gets crippled. Giratina does not appreciate burn, especially after SR [252 SpA Mega Mewtwo Y Blizzard vs. 248 HP / 252+ SpD Giratina: 206-244 (40.9 - 48.5%) -- guaranteed 2HKO after Stealth Rock, Leftovers recovery, and burn damage]; your team also has no way around hazards, so if they're set, they're permanent. MMY does not appreciate being Paralyzed, so you should run Lum Berry over Wise Glasses if you absolutely MUST run No Guard; and don't run Sludge Wave at all. Also, don't run Blizzard if your main method of walling it is Giratina, as shown by the previous calc they can kill you post-SR + burn damage from Inferno. Otherwise, just switch to Protean; it's pretty much better in every way.
Unaware Cresselia is a good mon. Unaware Quiver Dance Stored Power Baton Pass Cresselia is not, especially with Topsy-Turvy being as prevelant as it is. Unaware Cresselia should have more of a defensive role, not a quiverpass one. Something that is EXTREMELY alarming to me is that it has no recovery. How are you supposed to deal with setup if your one mon to deal with it can't heal? Leftovers is not healing, as it can easily be knocked off.
Your last mon is "please taunt me now, or maybe heart swap to steal my boosts or kill me with -ate" incarnate
hue ate incarnate. I need not say more.
EDIT: I forgot to mention that Ingrain on any Baton Passer is generally the worst move you could possibly put on a Baton Passer unless you run full BP and/or have an emergency escape, as Perish Song = Select one mon to die. Shed Shell gets around this, but really if you're depending on an item that can easily get knocked off to escape, you're doing it wrong.
Overall:
Your team is exceptionally weak to -ate, especially the omnipresent Pixilate Diancie-Mega; nothing can switch in on pretty much anything that Diancie-Mega has (and because of Boomburst you can't subpass to protect them either). Your only way to deal with Sturdinja reliably is Hoopa-U or Giratina [Lum + Recycle Sturdinjas exist; If you para a non-lum shed you pretty much autolose if Gira's dead]. If hazards get up on your side, they're staying there forever. You have no way to deal with status outside of Giratina. You have no way to deal with sleep outside of Giratina [and even so Mold Breaker just says "eh" to that]. Your MMY set is easy to Imposter with virtually no risk on the Imposter's part [this becomes 0 if the opponent has aroma/heal bell].