Me and my friend want to do a double battle and both of our Pokemon's level are kinda mix-mashed, like most of his Pokemon are 80-100 while my Pokemon's level are 50-80. I was wondering if there's an option in the Pokemon Centre if they could shrink any Pokemons LV. that's higher than 50 to automatically go to LV 50 so it would be an even match, just like how it's done in the Battle Frontier.
I thought there were three settings, Free Battle, Level 50, and Level 100. Try the WiFi downstairs because I know you have the three settings there.
Heart Gold and Soul Silver have Flat Battle, which is exactly like the Battle Frontier in terms of functionality.