When I was hacking with my old AR, I captured Lucian's Espeon from Platinum. It seemed to have all 30/31 IVs. Is this supposed to be?? Did Game Freak design it like this? Or are they EV trained with varying EVs to make it look like flawless stats?? I've been wondering this.
Yes, the Elite Four have flawless IVs to make them harder to beat.
Source: I read this on another question on the site, can't remember what question, but trust me, a reliable answer said so.