Alright, so I'm probably not going to have too much time to ladder with these Pokemon (mainly because Im testing other stuff atm!), but that sure doesn't stop me from posting!
I've used Victini before, and I found it to be a pretty competent Pokemon. The biggest problem of course, was the fact that it has to switch out a lot, so like Reshiram, Victini LOATHES hazards. I found Scarf to be a decent revenge killer. The biggest selling point for Scarf is obviously the fact that in the sun, V-Create OHKOs Mewtwo, while Mewtwo fails to KO Victini switch ins. Scarf V-create also does 70.5% - 83.1% to max HP Arceus, or 77.3% - 91.2% with Adamant (a OHKO after SR and Spikes), while CB was so freakishly powerful that some Palkia were taking over 50% in the sun o_O. As for Trick Room Victini, this is pretty much the reason why I even use Sun Trick Room teams in the first place, though it usually isn't the Pokemon setting up Trick Room, it usually comes in and mauls a Pokemon after Dialga or Palkia set it up. To give you a picture on how powerful this thing is, LO Brave V-create OHKOs max HP Arceus in the sun!
I'm not going to comment much on Landorus, except the fact that the MAIN reason I'm interested in it is because of U-turn. I'm thinking about putting it on some sort of Ubers volt turn team with Zekrom and Scizor, but I'm not sure if I have enough time to make such a team. I can't deny that the Spikes and Toxic Spikes immunity is a nice selling point over say, Groudon, but make sure you aren't using it as something Groudon, Garchomp, Ground Arceus, and Excadrill can do better!
Finally, lets talk about Kyurem... This is by far the Pokemon on the list I'm the most skeptical about, and in fact is a major reason why I wanted it on this research week! I did test it a while ago (the sets being Specs, Scarf, and Life Orb), and was completely underwhelmed by it. It wasn't that Kyurem was awful on its own... it was more like I felt it was completely outclassed by Rayquaza and Palkia in almost every situation imaginable. The only really benefits Kyurem provided in my experience was slamming Grass Arceus hard (and Rayquaza gets V-create now...) and not minding Hail. For those of you who are testing Kyurem, I want you to ask yourselves two questions, and maybe even post the answers here.
1. Is there anyway or situation where Kyurem is a better choice than Palkia or Rayquaza?
2. Are Kyurem's small niches really worth say, an analysis?
I'm guessing several of you are gonna say "But there's Hail!", but my main issue with that is in my expereince, Abomasnow uses its Hail rather selfishly (mostly for Kyogre and doing more damage with subseed). If that's Kyurem's main niche, then I'm really skeptical if Kyurem is really worth it over other better offensive choices like Rayquaza, especially since Hail isn't the easiest weather to keep up with Abomasnow's SR weak. But maybe I'm not looking at this the right way since I haven't used Kyurem in a long time, so please enlighten me if you think Kyurem really does have what it takes for Ubers!