Recently, Da Man added many Map NPCs, so that gave me an idea. How about adding a map called The Stadium, where players could actually battle Elite Four? It could be unlocked after getting all Gym badges and contributing certain number of Pokedex Entries, and players could battle them in this map, one by one, like it happens in the Pokemon games.
Upon defeating the champion, you would get something like a Cup or a Trophy, and the number of trophies you have won(the number of times you beat Elite Four) would be displayed next to your username on your profile and in forums. Rather than the actual number written, instead, there will be that many trophies displayed. If you win more than 5, it won't display more than 5.

However, beating all four of them will be very hard, as they will have 6 pokemon, and all of them would be 4 X your highest leveled pokemon.

The first Elite will have pokemon of equal level to your highest leveled pokemon, second Elite will have double leveled pokemon, Third elite will have 3 X, and fourth will have 4X

Make it so that your pokemon do not heal between battles, that would make it extremely hard, especially if a limit to using an item(s) were added like the Battle Tower.

Great idea. I'll make the Elite Four something to do with maps.

Time to work on it now :)

Yay, my idea has been implemented!
Elite Four in maps!!!