Dual screener Jirachi
Jirachi @ Light Clay
Ability: Serene Grace
EVs: 252 HP / 252 Def / 4 SpD
Impish Nature
- Reflect
- Light Screen
- U-Turn/Healing Wish
- Healing Wish/Iron Head/Thunder Wave/Stealth Rock/Wish
Jirachi is a cool dual screener, with good bulk and reasonable speed, as well as access to healing wish and U-Turn as escape moves. Healing wish is the primary choice for a suicide screener, while U-Turn is used for a slow switch to an unharmed mon or if you want Jirachi to be alive for later. You can opt to drop one of the escape moves for a STAB move like iron head to be a fairy check, or a utility move such as T-Wave, SR or Wish. I wouldn't use wish if you have healing wish though, as it only really wors great with U-Turn.
You can use SpD > Def if you prefer, but SpD is a standard set so I find it easier to use the unexpected Def to tank a hit from whatever they switched in to get the other screen up. For sets lacking U-Turn, you could use Jirachi as a fast dual screener, although other than for steel typing Latias does that better, and there's Klefki for a steel dual screener.