I don't know, I still feel like V-Create Trick Room tini is still a bit of a gimmick considering you need to be able to survive the hit from whatever, TR, and then hit back hard for the OHKO or such. SR weakness doesn't help its case either since that means it will have 25% of its health shaved off if it ever is forced to switch out for any reason which isn't that hard considering that huge amount of dragons in OU at the moment who can take any hit and threaten to OHKO it with their hit.
I was thinking about it some more, and realized that Trick Room Victini can still run Hidden Power Ice, considering it's not using a Special Attack decreasing nature. I was thinking...
[SET]
name: Trick Room
move 1: Trick Room
move 2: V-Create
move 3: Fusion Bolt
move 4: Hidden Power Ice / Brick Break
item: Life Orb
nature: Brave
evs: 208 HP / 252 Atk / 52 SpA OR 144 HP / 252 Atk / 112 SpA
ivs: 2 Spe
The EVs of the first spread give Hidden Power Ice a 100% chance of killing Salamence, with a Life Orb equipped. The second spread allows for a OHKO on 4 HP Garchomp with Stealth Rock damage. It also allows for a 2HKO on Latios with Stealth Rock, but this is only relevant really if Victini has already pulled off a Trick Room and can catch Latios on the switch-in. While it only takes 48 and 108 SpA EVs to KO Salamence (without Stealth Rock) and Garchomp (with Stealth Rock), the remaining 4 EVs are thrown into SpA to do a point or two more damage to Latios, Latias, etc. The HP EVs for both sets allow for an odd numbered HP, in order to switch into Stealth Rock four times. I think the second spread is preferred, really, considering how threatening Garchomp is (Ground-type STAB... Greeeeaaaat). Oh, and lastly, the 2 Spe IVs allow for max stats in everything else, while maintaining a 70 BP Hidden Power Ice at minimum Speed. Oh, and Brick Break is still an option to 2HKO offensive Heatran (with 100% accuracy, rather than 77%). Zen Headbutt was removed due to the fact that V-Create does more damage when not very effective, compared to neutral damaging Zen Headbutt. However, the ability to flinch from Zen Headbutt is pretty cool, along with the lack of reduction of defenses. So it may at least be worth an AC mention. But Hidden Power Ice is prioritized considering the threat of Dragon-types to this guy. Oh, and clearly, if not using Hidden Power, 248 HP / 252 Atk / 8 Def with 0 Spe IVs is best.
So Victini's ability to KO some dragons is a cool plus-side to this set, since Choice Band obviously doesn't help special damage.
Obviously, Victini's going to have problems with Dragonite, Latios, Latias, and Hydreigon. But pretty much every Victini variant has trouble with these guys anyhow.
-Zane
P.S. Who knows. Maybe it'll be the next new anti-metagame hit! (Move over Reuniclus!)