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I'm saying Calm is an inefficient use of Evs because you can reach the Same SDef and SAtk (and speed/hp) and still have 24 Evs to spare. Always give the highest stat a boosting nature (unless in the case of speed if you have to outspeed something).
OKay, then what would be your suggested EV spread instead of using Calm?
And just tested with Shadow Ball, so its not walled by Celebi. Not bad.
EDITed set:
Gardevoir @ Choice Scarf
Ability: Trace
Nature: Modest/Calm
EVs: 252 SpA, 240 Spe, 16 HP
- Psychic/Shadow Ball
- Focus Blast
- Thunder Bolt
- Trick/Will-o-Wisp/Ice Wind
This may seem like a weaker version of Alakazam, but has its uses. With a Scarf, Gardevoir outspeeds Weavile and makes a good revenge killer. It can Burn physical attackers switcing in, and makes a good DD Gyara counter. Coming in while they Dragon Dance, Intimidating them back, and OHKOing with T-Bolt. New in Platinum, Trick allows Gardevoir to cripple walls like Blissey. Energy Ball can be used for Swampert, or simply additional coverage. Focus Blast OHKO's even the bulkiest Tyranitar, and Psychic is good STAB.
Gardevoir has Trace, unlike Azelf and Alakazam aswell as superior Special Defense. With that it mind it can switch in on Heatrans, Gengars, and Flygon's and Bronzong's (watch for Gyro Ball) Earthquake too with ease. If you choose a Calm nature, you lose some power, but are garunteed to survive a non-LO Gengar's Shadow Ball. And you have a chance of surviving LO MixMence's Draco Meteor, and KO back with Ice Wind.