In my opinion the prestige of having nice or pvpable shinies and using them in pvp is already in the game.
Doing a different ladder for very few people who own them good shinies isn't something the game really needs. (imo)
Doing pvp is already hard for people with average/good pokes, considering the ones who are way more experienced and have almost perfect pokes. So i don't see how making an elite of the elite ladder would improve the game, since the good ones can already be used in pvp while the bad ones would get destroyed in both pvp and eventually shiny ladder.
-1 for me, i hope my thought about it was understandable because my english is pretty bad