How do you get to orange island in Pokemon ash gray?

Answer 1

After completing the Indigo Plateau regardless of beating the whole thing or not, you willl then need to head to Pallet Town and talk to Professor Oak and he will tell you to go to the Orange Islands because he wants you to run an errand for him and retrieve a mysterious Poké Ball that another Professor had gotten, you will need to use the river on Route 1 and head east in order to make your way to the blimp story that will advance the plot but you will need to enter the raffle that you can find in the Poké Mart that you'll come across. The Orange Islands part of the game will continue until the episode that's titled "A Way Off, Day Off" since the rest of the game is not completed as of June 24, 2014 and therefore doesn't include the remainng episodes.