No one knows this but I've been spending over a year(on and off) training a Lv. 5 Tepig into a Lv. 100 Emboar on Route 1 of BW before I meet up with Cheren and Bianca. He's currently Lv. 74.
Wow, this blew up. I'll update you again guys someday when I complete the goal. So far since last night, I've found 1 Rare candy. No shinies. And 84 hours in.