Man… I love the post-main-game stuff they added.
! There's a place where you can fight 3 random gym leaders and temporary field partners (per day) again, except they have pokes in the 60s. And the E4 gets an insane power boost after you beat them once, with all their pokes being levels 65-78. Your rival even gets his up to 85 O_O. No more grinding on fcking gravelers and onixes to get to 100.