All the codes for the Numberman Machine in Higsby's shop. All these codes can only be used once:

01697824 CopyDmg  *   
03284579 HeroSwrd P 
15789208 AirShot3 *   
21247895 HiCannon *   
31549798 Spreader *
33157825 GaiaBlde *   
50098263 Muramasa M   
54390805 Thndrblt *   
63997824 VarSword F 
65497812 Salamndr *    
76889120 StpCross S  
88543997 Tsunami  *   
95913876 GtStrght S
19878934 SetSand
23415891 AirShoes   
24586483 SneakRun  
41465278 WpnLV +1   
67918452 QuickGge
11002540 SpinBlue
28274283 SpinGrn  
72563938 SpinRed  
77955025 SpinWht   
90690648 Mr. Famous' wristband
05088930 Untrap  
24586483 SneakRun   
35331089 Unlocker   
46823480 Untrap
56892168 FullEnrg  
57789423 MiniEnrg    
86508964 MiniEnrg    
87824510 LockEnmy    
99826471 FullEnrg

You must collect all seven stars.

After you beat Alpha and have gotten all 5 stars and have beaten the Omega Navis go to Special Area 3.Now go to were Serenade is standing go behind her to face Zero.exe.His HP is 1500.Now go to Dexs Hp and there will be Zero.exe V2 with 1900 Hp. Finally jack into Higsbys Numberman mascot.V3 will randomly appear with 2400 Hp. Jack out and then go to were Alpha is he will be replaced by Omega Zero.exe with 3000 Hp.