A few codes to begin with:
Enable Code(Must be on):
000056D0 000A
10000428 0007
Unlimited Masterballs:
82025D34 0001
82025D36 0063
Max Items:
82025C96 0063
82025C9A 0063
82025C9E 0063
82025CA2 0063
82025CA6 0063
82025CAA 0063
82025CAE 0063
82025CB2 0063
82025CB6 0063
82025CBA 0063
82025CBE 0063
82025CC2 0063
82025CC6 0063
82025CCA 0063
82025CCE 0063
82025CD2 0063
82025CD6 0063
82025CDA 0063
82025CDE 0063
82025CE2 0063
All these cheats are from Code Breaker.Com:
http://www.cmgsccc.com/gba/index.php?multi=2
Any more questions just ask!!
Go to my forum for Cheats