Walkthrough:Pokémon Yellow/Part 1

Once you have started a new game, Professor Oak will introduce you to the world of Pokémon. Choose your name and your rival's name, and you'll be whisked to the wonderful world of Kanto.

Pallet Town
Once you spawn in your humble home, head left and interact with A with the box thingy. This is called a PC, and it holds items. Now, there's a Potion, which heals Pokémon. Head down the stairs, and outside. Here is Pallet Town, a small city filled with, well, not much. On the right is your rival's house, and under it is Professor Oak's Lab, where the professor will give you a Pokémon! Head there, and— He's not there. Just your rival, loitering around. Oh, well. Leave and head north to the grass. Just then, Oak, the professor will stop you! He states that Pokémon are dangerous and that you need one for your own protection. Then, a wild Pikachu will appear! Oak catches it in time. With the Pokémon out of the way, Oak will lead you to his lab for a Pokémon.

Professor Oak's Lab
Following Oak to the table, you then see your rival, inpatient and ready for a Pokémon. Oak then (to your rival's dismay) lets you choose the lone Poké Ball on the table. Go ahead and snag it— Your rival pushes you out of the way, and gets the Poké Ball anyway. Great. Oak then gives you that Pikachu he caught. Good, we have a Pokémon, so leave the lab..... Just then, your rival issues you to a battle!

First battle
Remember the potion you took out? Use it here if needed.

Eevee will simply use both of these moves, so simply attack.