Saito Style Chip  -  Enter NE-tsu-TO as your name in the tournament, then enter M9L1-24TZ-OQNU-MFZL-A6SY-HSA1 as a tournament code.

Secret tournaments  -  You need to complete the regular game by clearing tournament class S to unlock tournament classes X to Z.

Class X (Shadow Tournament)  -  Complete class S (Master Tournament).

Class Y (Ashura Tournament)  -  Complete class X.

Class Z (Chaos Tournament)  -  Complete class Y.

Yami Net Area (Survival)  -  Complete Class Z.

Getting the Data chips
Data chip 1 - Talking to Higsby for 20 times
Data chip 2 - Finish the Ajina Free battle
Data chip 3 - Finish S class
Data chip 4 - Finish the 128 tournament

Unlockables
AntiElec - Beat Tournament 32
AntiFire - Beat Tournament 32
AntiWatr - Beat Tournament 32
Anubis - Beat Tournament 16
Aqua+40 - Beat Tournament 64
AquaCust - Beat Tournament 128
Atk+30 - Beat Tournament 64
BigBomb - Beat Tournament 16
BlckHole - Beat Tournament 128
DblSnsr - Beat Tournament 16
DropDown - Beat Tournament 32
Elec+40 - Beat Tournament 64
ElecTeam - Beat Tournament 128
Fire+40 - Beat Tournament 64
FireRat - Beat Tournament 16
FrntSnsr - Beat Tournament 16
Geyser - Beat Tournament 32
GodStone - Beat Tournament 32
HeatGuts - Beat Tournament 128
Kunai3 - Beat Tournament 64
LavaDrgn - Beat Tournament 32
Navi+40 (rare) - Beat Tournament 64
OldWood - Beat Tournament 32
Popup - Beat Tournament 128
Recov200 - Beat Tournament 16
TimeBom3 - Beat Tournament 16
UnderSht - Beat Tournament 16
Wood+40 - Beat Tournament 64
WoodShld - Beat Tournament 128

Gameshark Codes

[M] Must Be On 92DAE5379B34 2EE318B74549 65941E8A6603
Infinite HP E62D2F934ACC
Maximum HP 64A23F93EEA1
Maximum AP A66D2FB24BCC A46E2FB2CFCC
Infinite Chip HP D2BDBF997AB8 D11CAFBF1EE6
Maximum Chip AP 2745AEB2638F D11CAFBF1EE6
Infinite Zenny 44B23759CEAD 9876C09C9151