Verified answer

Yes, you will be able to go back. But you must first beat the three legendary birds first.

Yes,but trust me its not fun...you gotta beat moltres articuno and go back and instantly have to fight rayquaza,where i got stuck, i hate it lol i sold the game lol

just go to this web site: http://www.gamefaqs.com/

it'll help with all game problems

yeah, just go through the adventure and theyll welcome you back with open arms and apologies all around.