The ladder hates me this morning. Some idiot leaves his scarf Ho-oh locked into BB against my max HP/def giratina and proceeds to crit me three times in a row. I've had Darkrai of all things get flinch hax consecutively against me, and somebody running Ice Beam on their Gyarados pull off a freeze. I've now rage quit for the day.
Rant over, time for something relevant...
Deoxys-D is a surprisingly good lead, I really wasn't expecting much at all. The first thing I tried was running it as a pseudo-lugia with hazards, then a pseudo-deo-S with bulk, neither worked, it needs to be played to it's own strengths rather than trying to emulate the psychics it has stuff in common with, but by the same token I've found both the analysis sets to be relatively ineffective. I've run a few different sets, but I've settled on a variant of the Utility Wall set, running max HP/Spe with Spikes/Recover/Seismic Toss/Magic Coat, and it's been pretty awesome. Other Deoxys leads get their stuff reflected back at them, Darkrai gets put to bed, Dialga gets laughed at without Draco Meteor and Groudon is laughed at in general. The only real lead it has issues with is good ol' Kyogre, whom I have a couple of counters for that have no issues switching in. The main issue that set faces is being used as setup bait once the opponent realises it's not carrying Taunt or Toxic, so I've found a couple of great partners in the form of Giratina and Balloon Heatran. Giratina can handle and PHaze most Arceus formes, Mewtwo and other special attackers, while Heatran can force the various dragons into locking themselves into Outrage or into using a weaker attack to break the balloon, giving an opportunity to throw out HP Ice.
tldr; Deoxys works quite well when played to it's strengths, doesn't use predictable sets and has proper support. It's not on the same scale of awesome as Mence, but it's certainly a viable player in various Ubers playstyles.
DW OU: Peaked #2
Ubers Research Week HoF: Silver (1335)