go to the battle frontier and go to the battle tower. when you are going to climb the steps on the left you will see a house. go in that house and talk to the lady facing the PC on the right. she will sell you the choice band for 64 battle points
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You can't in Fire Red or Leaf Green. You would have to trade the item over from Emerald or Ruby and Sapphire.
battle tower 48 bp
The Choice Band can be bought from a vendor on Pokemon Platinum in the Battle Frontier for 48 BP. To get BP simply take part in the various special battle arenas within the Frontier.
Just cook PokeBlocks or goof. The choice is yours.
You cant get a kanto starter on Pokemon sapphire but if you have Pokemon emerald then you complete the pokedex then you get a choice of starters from the johto region. I hope this helped.:)