What you will need:
Beginning of the game:
Charmander if you want Squirtle
Squirle if you want Bulbasaur
Bulbasaur if you want Charmander
Before you get the other Pok�mon:
Rare Candies (see the other cheats).
I don't know if this works for Pok�mon Red or not, but I know it does for Pok�mon Blue. The first thing to do would be to get a whole bunch of Rare Candies.
(You can look at the other cheats to find out how to do this.) Now, this will take two Gameboys. What I did is, I went to that guy in Viridian City, and I talked to him, doing the maximum stuff I could.
I have found that the more you do this in a row, the better the chances of it working.
Anyway, fly to Cinnibar after going to the Old Guy. After getting there, go directly to the ocean. Then, surf up and down.
I don't know how many times it would take, but you'll meet a lot of other pok�mon in the mean time. So, have fun!
Oh, and then do this on the other gameboy, and then trade.
More tricks, tips and cheats for this game are right here - Pokemon Blue cheats
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