Trick Room
Description (from Bulbapedia)
Reuniclus @ Life Orb
Trait: Magic Guard
EVs: 252 HP / 252 SpA / 4 Def | 0 Spe
Quiet Nature (+SpA, -Spe)
- Trick Room
- Psychic / Psyshock
- Focus Blast
- Shadow Ball
This Reuniclus pretty much wrecks in a metagame that runs rampant with Excadrill, Tyranitar, Genesect, Blaziken, Keldeo, and other Speed demons. The idea is quite simple, abuse Life Orb + Magic Guard and the power granted by using Trick Room on turn one and sweeping right after that. Psychic and Psyshock are reliable STAB moves, and though Psyshock is less powerful, it hits CM Keldeo harder. Focus Blast deals massive damage to any resists, and Shadow Ball provides perfect Ghost / Fighting coverage. Basically, Reuniclus has all the tools it really needs to sweep well in the Dream World metagame.
There are of course many other viable users of Trick Room out there. What do you guys think? Is this a strategy that can only be relegated to standard play, or is it perfect for Dream World? Also, what users of Trick Room do you guys find viable? Go forth and discuss!

Description (from Bulbapedia)
We should all know what Trick Room is and what it does. However, it's rarely seen in the Dream World metagame, even when Speed is probably the defining part of this metagame. What do you think about it? Should people use Trick Room more? I personally have been screwed over by Trick Room multiple times, especially when I only have Excadrill and another fast sweeper left, as Reuniclus is one of the most powerful Pokemon out there, despite its lack of Speed. Furthermore, it isn't limited to using Hidden Power Fire or another Hidden Power because it already OHKOes Genesect with Focus Blast. Here is the set I am talking about:Bulbapedia said:Trick Room reverses the move order within each priority bracket so that Pokémon with a lower Speed stat attack first, whilst those with higher Speed stat will attack last. Individual brackets are still maintained; moves in higher priority brackets still work before moves in lower ones regardless of Trick Room. This effect lasts for five turns. Similar to Magic Room and Wonder Room, using Trick Room while it is already in effect will end it immediately.
Effects that alter the order of specific priority brackets override Trick Room. Therefore, Pokémon holding Full Incense or Lagging Tail and Pokémon with Stall will go last in their priority bracket regardless of their Speed stat. Pokémon activating Quick Claw will go first in their priority bracket.
Trick Room is in the -7 priority bracket and therefore will always go last, except against slower foes also using an attack in the same bracket.

Reuniclus @ Life Orb
Trait: Magic Guard
EVs: 252 HP / 252 SpA / 4 Def | 0 Spe
Quiet Nature (+SpA, -Spe)
- Trick Room
- Psychic / Psyshock
- Focus Blast
- Shadow Ball
This Reuniclus pretty much wrecks in a metagame that runs rampant with Excadrill, Tyranitar, Genesect, Blaziken, Keldeo, and other Speed demons. The idea is quite simple, abuse Life Orb + Magic Guard and the power granted by using Trick Room on turn one and sweeping right after that. Psychic and Psyshock are reliable STAB moves, and though Psyshock is less powerful, it hits CM Keldeo harder. Focus Blast deals massive damage to any resists, and Shadow Ball provides perfect Ghost / Fighting coverage. Basically, Reuniclus has all the tools it really needs to sweep well in the Dream World metagame.
There are of course many other viable users of Trick Room out there. What do you guys think? Is this a strategy that can only be relegated to standard play, or is it perfect for Dream World? Also, what users of Trick Room do you guys find viable? Go forth and discuss!