How do you get max cash on Pokemon Diamond?

There IS a code for max cash, press L+R to enable:

94000130 FCFF0000 B21C4D28 00000000 B0000004 00000000 000002E4 000F423F D2000000 00000000

I don't remember how much you gain, but challenging the elite four could give you good money. Even if you don't get far, you at least are training your pokemon as well and when you come to the point of easy victory over Aaron (Infernape alone could do this since he could use super affective moves on most of his pokemon if it has a fire move like flamethrower). What you could do is keep going until you reach the champ then lose on purpose and you still have a big money gain.

The maximum cash you can get is 1,000,000 Poke Dollars. What I did is buy as much items as I can with the money I already have. Then get the Amulet Coin and attach it to one of your Pokemon. If you don't want to battle the E4 again, go to Route 212 below Hearthome City. Battle Gentleman Jeremy and Lady Reina. They give you 24,000 Poke Dollars with the Amulet Coin. Use the Vs. Seeker to battle them again and again.

Hope I helped!

1) Equip the Amulet Coin to one of your battling Pokemon. Feel free to switch this around.

2) Battle every single trainer in the game, and rebattle the Elite Four as much as possible.

oh wow! that's SO awsome!

you still play it?!

by the way whats your friend code?

oh and there's no code for max. cash

what i do:battle the elite 4 over and over again :)

ive reached max. more than 8 times now

so i just buy a bunch of randomn stuff

or buy the action replay at walmart for 20 bucks and get it :)

Losing at champion isn't quite a good thing as losing halves your money.

Either beat E4 over and over, or go south of Herthome and beat the 2 old people over and over (VS seeker).