Don't go for Naive/Rash nature for Alakazam. Because his attack stat is useless (he depends on special attacks), you should go for a nature that detracts from the attack stat. I'd recommend Timid.
Also, Double Team is banned, unfortunately... for a replacement, you could run Shadow Ball, but I don't know how good that would be for coverage. Thunder Wave is also a possibility.
I don't know too much about Blissey (I've never been a huge fan), but I can assure you that you want to maximize those defense EVs. You should probably go for a Bold nature, too. But like I said, I'm no Blissey expert :P
I also don't know very much about Gliscor, but Starmie might be better than Alakazam, actually. Here's my Starmie:
Starmie @ Choice Specs
252 Special Attack, 252 Speed, 4 Defense
Just something to think about. It's been a pivotal Pokemon for me; maybe you could make use of it too :)
As a last note, this probably belongs here
, but I'm sure a mod will move the thread if they feel the need