Battle more trainers and beat them.
24$
money ran away
The code for infinite money in Pokémon FireRed is 74000130 03F5820257BC 423F,74000130 03F5, 820257BE 000F. This code has been tested and verified.
beat the elite 4 alot
it give a lot of heath for not a lot of money
You get money by selling items or beating other trainers in a Pokemon battle
Ace Trainers Dragon Tamers
To sell for quite a lot of money
This is the Master code that must always be on. 9820F6AE820351F0DBDF70D1407403064659This is the money cheat for Fire red.7B9BF36F3E54057F598C429E67506BC45CBD00B6F1903AF7CC4F8C630144A30F4BE92B374EA3D5281636424F078E7AD10FC3F521963E832B1FF442CB6FA755041618C70BBAD883D3C5B56DEED1B8
They ran out of money
In Pokemon FireRed and LeafGreen you can't open a gym.
Only simple easy way is to get an coin amulet an fight trainers.