Also available in this area in the postgame is this game's version of the boss rush, against all 16 'gym leaders'
They're all the same, but the difficulty mode you choose decides when you get healed (the game will also remove your healing items to prevent cheese)
I'm not going to do it, but the reward for this is a potion that makes your next encounter shiny (easy), a mega evolution stone for a certain pokemon we're about to get (normal), and a pure bragging rights reward badge (master)
Oh yeah, and coming back to
>>52516840, you can use Unktena for this, so it wouldn't be too hard to carve through them all, just time consuming
