first you have to have Pokemon lv 70 or up and you have to battle evrey Pokemon they throw at you.then when you get up to certin nuber of Pokemon you battle the champ.
beat the frontier brains
Beat Elite Four.
there is no battle frontier in Pokemon pearl,but there is a battle tower. you can go there after you beat the elite 4
after you beat a certain amount of challenges you will battle a frontier brain which is sort of like the gym leader. if you beat them you get a symbol
After you beat the Elite Four, go to the Battle Frontier.
Beat the Elite four and the Champion.
lv 100
because i have never been beaten in a Pokemon battle except for the battle frontier. because i am the best
beat the battle frontier!
yes
beat all battle frontier leaders
There is no Battle Frontier in Ruby. Only in Emerald, Patinum, HeartGold and SoulSilver.