This is my first build for Akali, I will comment soon. But please try this build out, its somewhat expensive item to gather but if you can get all of these items, you can probably get 4 to 5 kills, if your lucky. Please look at her stats before commenting and do try her build out too.

This is my normal build for 3v3 and 5v5, normally I tend to solo these 3v3 and 5v5 a lot, since majority of my friends aren't online during the time I play. Basically this build provide some flexibility for survival and against those 2 v 1 situation.
Runes:
3 x Greater Quintessence of Potency = 4.95 ability power x 3 = 14.85
9 x Greater Seal of Potency = 0.59 ability power x 9 = 5.31
9 x Greater Mark of Desolation = 1.67 armor penetration x 9 = 15.03
9 x Greater Glyph of Insight = .57 magic penetration x 9 = 5.13

The runes makes great usage for her, especially her 2 passive, it brings them out or you can use them at lvl 1.

Masteries Tree:
22 offense 0 defense 8 utility

Skill Setup:
Try to max Mark of Assassin and Crescent Slash as fast as you can but you should also max Shadow Dance when it becomes available.

Please try and comment plz!!!