Follow These Steps To Enter The Battle Frontier
#1:Have strong Pokemon like in the 60s/50s
#2:Have some potions like (super) potions
#3:Make sure you have beaten the following gym leaders-Falkner,Bugsy,Whitney,Morty,Chuck,Jasmine,Pryce,Clair.
#4:Make sure you beaten-Will,Koga,Bruno,and Karen
#5:I have never been to the Battle Frontier (don't ask me why im answering becuz Im right)
#6:The Battle Frontier is now opened
#7:Enjoy
Go to Olivine City, go west... Then go into the "green thingey" apparently there is a sleeping man in it, so u can´t go in it... U need 2 beat Pokemon league and then u can go into the "green thingey"... and u can reach Battle Frontier!
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Battle frontier
You can get Aerial Ace by buying it at the Battle Frontier.
beat the Pokemon league and go back to the entrance
You'll need to buy it at the Battle Frontier with BP.
Yes. you can take it to the battle frontier and have someone teach it outrage for Pokemon heartgold/ soulsilver