Poison
If your down to your last Pokemon, you don't have any potions, he is poisoned, and low on health this will help.
It will take awhile but walk 3 steps, since you have to walk 4 steps for your Pokemon to take any damage it wont take any damage, after you walk 3 steps save it and do a soft reset or you can turn the game off completly. Load the game walk another 3 steps and your Pokemon still will not take any damage and you can do this till you get to a Pokemon Center without losing any money.
More tricks, tips and cheats for this game are right here - Pokemon Yellow: Special Pikachu Edition cheats
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