Pokemon HeartGold: 200x EXP.

A4000130 FEFF0000
1206FADA 00000068
1206FB2E 0000E03C
0206FB30 07808960
1206FB44 00000F85
D2000000 00000000
94000130 FEFF0000
1206FADA 0000006C
1206FB2E 000020C8
0206FB30 E03A4345
1206FB44 00008965
D2000000 00000000

The 200x EXP. code will multiply the number of Experience Points you get times 200.