You have to win 7 times in a row
you have to beat a number of people first battle castle = 21 battle factory = 21 battle hall = 50 battle tower = 21 battle arcade = 21
usually there are side quests such as battle frontier or continued problems with criminal organizations or you can just try to catch every pokemonif its diamond pearl platinum soul silver or heartgold u can go to the battle frontier and battle random people
you have to battle your way through until you get to the cave. then battle the leader there.
Battle them and Beat them.
if you win streak at 21 and you need a leendary because he only use some legendary pokemons (sometimes)!!!!!!!!!!!!!!remember!only just 50 percent from frontier brain nolland because nolland is strong so good luck.....it helps just do that instruction so you can win like in easy ways
I just used a cheat to walk anywhere but I think you have to do something in the areas next to it like the Battle Frontier and the resort area.
lots of people have them but the most obvious place to see on is in the 5th gym by battling the people one the way to the gym leader
the people on the far left and right is your character, and the people in the background are the frontier brains
You, talk to them, and then fight them. And win.
you face six people then the seventh battle is the leader
Go into the Battle Frontier (Fight Area) and then go inside. Then, you climb some stairs and on the bottom left, there is an entrance to what looks like a castle. Go inside and battle people there. Every time you win, you earn CP (castle points).
yes, but only in multi battle.