Equinox, EV training's a bit tricky when you're first starting out; you have to keep in mind that each and every time your Pokemon gets experience, they get that Pokemon's EV distribution as well. Thus, the way to start EV training is with a level 1 (or otherwise untouched) Pokemon.
If your Scyther in question has just been used in-game and trained against whatever, finding the EVs will be practically impossible; you will need to use the EV-reducing berries to reduce all EVs to 0 and then find out.
But in that case it's usually just easier to start fresh and breed a new one.