Has defiant changed n Pokemon x&y?

Question

im fighting a defiant pawniard, my greninja uses smoke screen and defiant raises attack by 2 STAGES has it always been like that?

Answer 1

>Whenever an attack by an opposing Pokemon or an ability from an opposing Pokemon causes a stat stage of the wielder to be reduced, its Attack is raised by 2 stages. Defiant triggers once for each different stat stage reduced.

Smogon Gen 5

So yes, it has always been like that.