Pikachu

You choose Pikachu!

Professor Oak goes and gets Pikachu's Pokeball. Having see it done many times before you throw the Pokeball and release Pikachu. There is a bright flash of light and before you a Pikachu appears. It looks at you.

"Pika" it says, but not in the cute voice you were expecting, but in a growl. Not only was the it a growl, but it was deep and sounded as if the Pikachu smoked a lot.

The Pikachu jumps at you and starts to scratch at your face. You manage to get it back in its Pokeball before it does any real damage.

You start to yell at Professor Oak, but he quickly pushes you out, giving you five more Pokeballs, and a Pokedex. Telling you that it's your problem now.

Ash decides to head North to Viridian City. You need to start becoming a Pokemon Trainer.