With so many Trick Room teams and Rock Slide spammers running around, I decided to try out a move, which is rarely seen outside of some BH memes - Imprison. It turned out to be very useful, so useful that I even slapped a Psychium Z on Victini to be able to use Z-Imprison of needed.
The main reason why Imprison is so useful in PiC is that it seals eight moves - those of the user and those of the user's ally - which can drastically hinder the opponent by blocking Protect, Recovery and - most important - Trick Room from going up.
This is my main Imprison user:
Victini @ Psychium Z
Ability: Victory Star
EVs: 252 HP / 252 Atk / 4 SpD
Jolly Nature
- V-create
- Stored Power / Bolt Strike
- Trick Room
- Protect / Bolt Strike
Imprison is donated by a Kyurem-Black, but the almighty god of OU, Landorus-T, can donate it too, for example. When facing a TR team, the main goal is to set up a Z-Imprison, which goes through eventual taunts and boosts Victini's Special Defense, so that it becomes difficult to take down; also it boosts Stored Power a bit. Then, you can start snowballing by bringing in Contrary Serperior and using V-create. The good bulk, especially after a few boosts, makes it very difficult for the opponent to "unlock" Trick Room.
Against non-TR teams, you can either do the usual contrary stuff, or set up your own Trick Room, which is especially nice against extremely fast teams and makes the team very flexible.
When facing Rock Slide spammers,the fight becomes much easier as soon as you get off an Imprison with Kyurem-Black or Landorus (both know Imprison, the latter also has Intimidate to lower the opponent's damage output).