Pokémon Red Version/Walkthrough/0000 - Pallet Town

When you begin the game, you will be in your character's bedroom. Use the PC immediately, and access the item store; withdraw the potion. Leave the house, and immediately head north to the grass. As soon as you step onto the grass, Professor Oak beckons for you, and escorts you to his lab. Both you and his grandson, who is already at the lab, are each offered a Pokémon by Professor Oak.

Once you pick your Pokémon, your rival will pick the one with an immediate type advantage; this isn't very crucial now but it will become significant later on. The prize for winning is some money, and a level gained for your Pokémon; the potion removed from the PC earlier will aid your chances of winning. Once the match is over, head to Route 1.