Should I have 252 EVs in Defences,or252 EVs in Speed and Attack?Because electivire has low defenses.And needs to survive.
Electivire's cause of life is to be a Hardcore Sweeper. And then a normal sweeper EV Spread for Electivire would be: 252 Atk 252 Spe 4 HP
or...
200 Atk 200 Spe 110 HP
Both of these spreads work well. You can try out a fast staller Electivire but I doubt the success:
252 Spe 252 HP 4 Def/SpD
Speed and attack. Electivire is a sweeper.