I'm playing Omega Ruby, and I'm breeding/hatching eggs. While doing so, I sneaked up on a Volbeat just for the heck of it, and I saw it had 3 star potential. This happened before, and I decided to catch it, but I didn't see anything that special about it. It's moveset was Tackle, Double Team, Confuse Ray, and Quick Attack. It holds Bright Powder, it's nature is Mild,ability is Swarm, and characteristic is somewhat vain. Am I missing something? How come this Volbeat and a couple other mons like this have 3 star potential, but other mons with egg moves and such don't?