When you have defeated the Elite 4 and Gary, Prof. Oak will come and congratulate you, your Pokemon will be entered in the Hall Of Fame. You will see a message saying: Entering Pokemon into Hall of Fame SAVING DO NOT TURN POWER OFF. Don't turn the power off, you will be VERY sorry if you do! You must wait for the saving sequence to finish. After that you will see the credits. The credits are somewhat long so you can go ahead and turn off the game. Whether you turn off the game of decide to watch the credits, next time the game starts you will be in front of your house in Pallet Town.