I took a level one Scizor to Victory Road for EV training in attack(Having him hold a power bracer).I defeated a Golurk and my Scizor gained a lot of levels.So,my question is,how many EVs did it gain?
The level of the Pokemon gaining the EVs doesn't affect how many it gains at all. For example, if you battle a level 3 Patrat with a level 96 Terrakion, it will gain the normal 1 attack EV.
Source: Experience