Pokémon Sun & Moon: 10 Forgotten Features That Must Return
4. The Battle Frontier
There have been a number of variations on the end-game challenges across the Pokémon series, with all of the more recent entries to the series offering up some sort of perpetual battle area to keep players interested. So far, none has done this better than the fourth generation's Battle Frontier.
The Battle Frontier featured a number of stages that each placed unique twists on the regular patterns of a Pokémon battle, forcing players to continue to reassess and improve their strategies even after becoming Champion of the region. Getting to challenge and defeat the Frontier Brains after putting win-streaks together in each area was genuinely testing, and a worthy endgame contest.
Since it's not likely that the developers will deviate from offering non experience-based challenges after players defeat the Elite Four in Sun & Moon, this would certainly be a welcome replacement.