Using Nugget Bridge Glitch
When you go north of Cerulean City you have to defeat five trainers before fight team rocket grunt that gives you a nugget. If you lose the battle and go back he gives you another nugget. His Pokemon don't gain experience.
To take advantage of this...
1) The most costly thing in game is Porygon in Celadon Game Corner. In FireRed you need 40 nuggets to buy the 9999 coins for Porygon. 26 is needed for LeafGreen for 6500 coins. All the rest of the Pokemon sold there is in the wild.
2) Use the battle to train pokemon. The first Pokemon is Ekans in which has 198 exp. Points. You do want to lose some life to it because the second Pokemon is a weak Zubat. Not best for training Geodude but for most Pokemon it is fine
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