This set
has NOT been tested, but I feel that it can do at least decent against the top leads.
Jirachi @ Lum Berry
Nature: Careful
252 HP / 252 Def / 4 Atk
- Stealth Rock
- Thunder Wave / Wish / Screens
- Iron Head / Ice Punch / Fire Punch
- U-Turn
What it does
Vs. Deoxys-s
This set walls Deoxys-s, but sadly cannot prevent it from setting up. The best option is to U-Turn out to break the sash, while Deoxys-s uses Taunt.
Vs. Groudon
This is where it has the most trouble. You can set up SR, or try to flinch it a bit. Without an Impish nature though, Earthquake will OHKO :/
Vs. Darkrai
Lum Berry will fix the sleep problem, allowing you to Thunder Wave. From there, Iron Head is a garunteed 3HKO.
You lose against trick scarf, if you set up sr, and Jirachi is slow as hell, even with a scarf, thanks to no speed. Although a scarf Jirachi that can't even revenge +1 Jolly ray is a loss in my book. Although paralyzing Darkrai early in the game is helpful, you still lose something.
Vs. Shaymin-S
Earth Power cannot 2HKO, and you can cripple it with T-Wave and then Ice/Fire Punch or Iron Head.
Vs. Deoxys-A
Deoxys-A typically only has stealth rock, and you can destroy the sash minimum.
Vs. Kyogre
It will be able to set up SR no matter what set it is.
Kyogre is mostly t-wave lead, and paralyzing it is basically useless. I'd just sr and u-turn to something like Palkia.
Vs. Dialga
It's STAB moves are resisted by Jirachi, and will a Careful nature it won't take much damage from any special attacks.
Flamethrower will 2hko, and it still sets up sr, and won't be crippled much by Paralysis thanks to lum, and even the leftovers variety isn't hurt much thanks to no speed.
Vs. Scizor
Fire Punch is listed up there for this Pokemon. Scizor has no SE moves vs. Jirachi, and it won't be expecting the Fire move.
The main use of this Jirachi is to set up SR, and cripple faster leads with Thunder Wave. U-Turn is great so Jirachi can be used later game, since steel types do well in an environment containing many Dragon and Ice-type moves.
Another option instead of a bulky set would be a Trick(Scarf) lead. The only down side I noticed has been that it cannot outspeed Deoxys-s.
If someone is willing to test this lead, or criticize it/make it better, that would be great ^_^