Pokémon Yellow
Pallet Town
You will start in Ash's house. (Like in Pokémon Blue/Red.) Go to the computer and access your PC, get the potion because you'll need it for later use with your Pokémon, then go downstairs. Go outside, now go to the very north, you should see some grass looking areas, go onto it, before you get far, Prof. Oak will stop you and lead you to his lab. Here you will receive your first Pokémon, Pikachu! Before you get out of the lab...
Vs. Gary: I
Gary will challenge you to your first match. If you win, you get some money, if you lose, Gary gets the bragging rights. One more thing, Pikachu will grow to level 6 if you win.
Route 1
Now that you have a Pokémon, go on to the bush in the north and find fights, get Pikachu up to level 10. If Pikachu faints (make sure that it doesn?t, run from battles if you need to), you?ll be back in your house, talk to your mom and go back onto Route 1. Make your way through the route, talk to anybody you see, one guy will give you a free potion, another will tell you a "faster" way to get home.
Viridian City
Go directly up and right to that first building (with a "Poké" sign on it) and go inside, go up and talk to the nurse behind the counter (yes, it?s a nurse, whistle!) she?ll offer to heal your Pokémon, select heal. Now go northeast to the Pokémart (with a "mart" sign), you?ll receive Prof. Oak?s Parcel. Go back to Pallet town, picking fights as you go (get Pikachu up to level 11).
Pallet Town
Go back into Oak?s lab and talk to him, he?ll give you and Gary each a Pokédex. Now go into Gary?s house and get a town?s map, despite what Gary said, his sister will still give you map. (Weird huh?)
Route 1
Now get Pikachu up to level 12. Go into Viridian City.
Viridian City
Now heal your Pokémon. Get a potion and 6 Pokéballs at the Pokémart, you?ll need them later. If you don't have much money, don't buy the Pokéballs. Fight some trainers and WIN because if you lose, you will have less money than before. Go back to Route 1.
Route 1
Capture a Pidgey and raise it to level 10, capture a Rattata and raise it to level 7 (it should have learned quick attack). Your Pokémon should be around level 12 or above, it would be good. Go back to Viridian City. Route 2 Switch your Pidgey as your leading Pokémon. Now go north into Viridian Forest. (Don?t forget to heal your Pokémon at the Viridian PokéCenter first. If your Pokémon are only hurt a little, use a potion or two.)
Viridian City
Go to the PokéCenter and heal your Pokémon, go up and stop when you see an old man. Go left and you?ll see a bush. Press A and you?ll find a secret potion. Now go north to the Viridian Forest.
Viridian Forest
(Many Pokémon) Now with a level 10 Pidgey leading, Pikachu at level 13, and a level 8 Rattata (you won?t be using this much, only to catch some Pokémon) you?re ready for the forest. Immediately go up and turn right into that bush of grass. Now you can find the caterpillar Pokémon Caterpie. Use this chance to build up your other Pokémon. Fight with a Caterpie until level 12 (it?ll evolve twice). The final evolution of Caterpie is Butterfree, his Psychic attack, Confusion, will be a big help soon! Remember to go back to Viridian City if you need medical help.
Viridian Forest (getting through the forest)
At the entrance, head northwest to find a Pokéball. Go back to the entrance and go right again, follow the path to find a Bug Catcher , he should be no problem if you have a level 12 Butterfree and a 12 Pidgey. Go up the grass bush, you?ll be challenged by another Bug Catcher. Go up and get the potion, remember if your monster have fainted or has really bad/low health (what I mean by bad is situations like poisoned, etc.), go back to the Viridian City PokéCenter. Use potions and antidotes only if you really must. Keep on going, follow the road as it zigzags through the forest. Keep on going until you reach another fork in the road, you should be facing south when you encounter it. Go right and down to find another potion. From there make your way to the northwest. There?s another Bug Catcher in your way but it?s nothing you can?t handle. Go north and exit.
Pewter City
Instead of going to Brock, go heal your Pokémon and go back to Viridian City instead, and from there, make your way west of town.
Route 22
This is a great place to capture new Pokémon. Don't miss both Nidorans, Spearow, and especially Mankey. If you go to far you will run into...