As you boot up the game, you will be greeted by Professor Birch, and he will give the standard world of Pokémon speech. You will then be asked to choose your character's gender. Choose whichever you like, it does not make much of a difference on the storyline. The one you don't choose will end up as your rival. Birch will then ask for your name. You can enter up to seven characters, or pick one of the default names. You will then start off your journey.
After the intro, you will find yourself in a moving truck, which will take you to Littleroot Town.