I've always avoided posting in this thread since I noticed that people are very critical about submitted sets as being not creative, unoriginal or just-not-good, but I may just have something worthy of sharing. Mind you the set may be weird, and it might not work for all teams, but this has been the secret to my current unexpected winning streak. Here it is:
Jirachi @ Focus Sash
Trait: Serene Grace
EVs: 252 HP / 252 Spd / 4 Atk
Jolly Nature
- Trick Room
- U-turn
- Wish
- Stealth Rock
"Trick Room on a Pokemon with a base speed stat of 100, Jolly nature and full 252 Spe EV's? Blasphemy!" you might think, but please hear me out. Having a fast U-turner that learns Trick Room is exactly what I needed, and if you are looking for one, Jirachi's the best there is. So what exactly is the deal. Basically lead with this Jirachi and set up Trick Room ASAP, which the opponent won't expect. This element of surprise, as well as the focus sash, guarantees TR is up first turn no matter what. So now with the dimensions twisted, Jirachi would most likely be going second, which is exactly what it aims for. A slow U-turn ensures that my next Pokemon comes in completely unscathed. This gives me an ensured opening onslaught with my TR abuser (which is another jewel I uncovered). The last two moves may be filler, but they've come in handy many times. Trick Room~Wish~slow-U-turn ensures the switch-in gets the healing (I hate it when the switch-in dies before receiving the wish!). Use Stealth Rock only when the opponents team is very vulnerable to it. I usually don't need hazards up unless the opponent has a Volcarona or Dragonite.