Zone really rapes the metagame right now. Not only is a foolproof way of getting rid of Scizor (invaluable for offensive teams), it kills those annoying Scarf Jirachi leads and removes things like Skarmory and non-EQ Bronzong for Salamence to sweep. Not to mention the 'synergy' it has with Salamence. Really a great pokemon =P.
I know; in fact, that was the reason I had to make an all new team for suspect--my last team kept getting killed because--get this--it had too many steel types and kept getting owned by Magnezone, but my new team only has two and still has no problems dealing with Latias. I've also found using non-choiced Jirachi effective; I may not outspeed Latias, but I can still kill things like Tyranitar, Scizor, Mamoswine (with SR and a little flinchhax luck, mostly) all while being able to run from Scarfzone with U-turn to something that can kill it, usually my Rhyperior or Latias. Being unable to OHKO Lucario with Fire Punch is a pain, though. And even with being unable to outspeed Latias, I can still manage to kill it no problem despite my team not packing Tyranitar, Scizor, or Metagross.