Changed the EV spread. I understand Zam is not easy to switch in whatsoever, but it isn't meant to be coming in and out continuously throughout the match. Its meant to clean up the opposing team once it is able to get a free switch in.It sadly can't switch into anything on Team 2 without the need for Rotom's Volt Switch. Celebii is almost always going to be the one who switches in to Rotom-W and that's a hard fight one-on-one for Alakazam. Zam can't Sub up as it'll just be eating away at it's own HP making Subs that Celebii pops with Giga Drain. If it attacks it risks a Thunder Wave. Although Recover stalling risks a crit, Shadow Ball isn't hitting hard enough that Celebii can't shrug it all off after 4-5 turns and if it spams Giga Drain it'll heal enough to save a turn or two.
252 SpA Life Orb Alakazam Shadow Ball vs. 252 HP / 224+ SpD Celebi: 174-205 (43.06 - 50.74%) -- guaranteed 3HKO
0 SpA Celebi Giga Drain vs. 4 HP / 0 SpD Alakazam: 93-111 (36.9 - 44.04%) -- guaranteed 3HKO
That heals about 11-13% per hit and about 7% when popping a Substitute.
By the way, move that HP EV someplace else since it is giving Zam an HP stat perfectly divisible by 4. (so it can only make 3 Subs)
Calcs:
252 SpA Keldeo Hydro Pump vs. 0 HP / 4 SpD Alakazam: 222-262 (88.44 - 104.38%) -- 31.25% chance to OHKO
This is the only pokemon that can outspeed Zam as of right now and does not even score a guaranteed OHKO. Of course the opposing team could still pick Politoed and completely ruin that since Keldeo would have a rain boosted Hydro Pump. like I have said previously, in the hands of a good player (which it will be), Kazam will do massive damage.