The following are known Action Replay Codes for Yu-Gi-Oh! Dark Duel Stories on Nintendo Game Boy / Color (GB / GBC). These codes were also known as GameShark Codes and in most cases will work on both devices.

Device Compatibility: Action Replay & GameShark

P1-Inf LP
9199c7c5
9199c8c5

P1 – No LP
9100c7c5
9100c8c5

P2 – Inf LP
9199cac5
9199cbc5

P2 – No LP
9100cac5
9100cbc5

Weak Opponent
9100cac5
9100cbc5

Have B.eye Wh
920300d0

Have Mystical
920301d0

Have Hitotsu
920302d0

Have Baby Dra
920303d0

Have Ryu-Kish
920304d0

Have Feral Im
920305d0

Have Winged D
920306d0

Have Mushroom
920307d0

Have Shadow S
920308d0

Have Blacklan
920309d0

Have Sword Ar
92030ad0

Have Swamp Ba
92030bd0

Have Tyhone
92030cd0

Have Battle S
92030dd0

Have Flame Sw
92030ed0

Have Time Wiz
92030fd0

Have R Leg of
920310d0

Have L Leg of
920311d0

Have R Arm of
920312d0

Have L Arm of
920313d0

Have Exod. of
920314d0

Have Summoned
920315d0

Have The Wick
920316d0

Have Skull Se
920317d0

Have Horn Imp
920318d0

Have Battle O
920319d0

Have Beaver W
92031ad0

Have Rock Ogr
92031bd0

Have Mountain
92031cd0

Have Zombie W
92031dd0

Have Koumori
92031ed0

Have Two-head
92031fd0

Have Judge Ma
920320d0

Have Saggi th
920321d0

Have D.Magici
920322d0

Have The Snak
920323d0

Have Gaia the
920324d0

Have Gaia The
920325d0

Have Curse of
920326d0

Have Dragon P
920327d0

Have Celtic G
920328d0

Have Faceless
920329d0

Have Karbonal
92032ad0

Have Rogue Do
92032bd0

Have Oscillo
92032cd0

Have Griffore
92032dd0

Have Torike
92032ed0

Have Sangan
92032fd0

Have Big Inse
920330d0

Have Basic In
920331d0

Have Armored
920332d0

Have Hercules
920333d0

Have Killer N
920334d0

Have Gokibore
920335d0

Have Giant Fl
920336d0

Have Larvae M
920337d0

Have Great Mo
920338d0

Have Kuriboh
920339d0

Have Mammoth
92033ad0

Have Great Wh
92033bd0

Have Wolf
92033cd0

Have Harpie L
92033dd0

Have Harpie l
92033ed0

Have Tiger Ax
92033fd0

Have Silver F
920340d0

Have Kojikocy
920341d0

Have Perfect1
920342d0

Have Garoozis
920343d0

Have Thousand
920344d0

Have Fiend Kr
920345d0

Have Jellyfis
920346d0

Have Cocoon o
920347d0

Have Kairyu-s
920348d0

Have Giant Ro
920349d0

Have Man-eati
92034ad0

Have Krokodil
92034bd0

Have Grappler
92034cd0

Have Axe Raid
92034dd0

Have Megazowl
92034ed0

Have Uraby
92034fd0

Have Crawling
920350d0

Have Red-eyes
920351d0

Have Castle o
920352d0

Have Reaper o
920353d0

Have King of
920354d0

Have Barox
920355d0

Have Dark Chi
920356d0

Have Metal Gu
920357d0

Have Catapult
920358d0

Have Gyakuten
920359d0

Have Mystic H
92035ad0

Have Rabid Ho
92035bd0

Have Zanki
92035cd0

Have Crawling
92035dd0

Have Crass Cl
92035ed0

Have Armored
92035fd0

Have Dragon Z
920360d0

Have Clown Zo
920361d0

Have Pumpking
920362d0

Have Battle W
920363d0

Have Wings of
920364d0

Have Mask of
920365d0

Have Job-chan
920366d0

Have Curtain
920367d0

Have Tomozaur
920368d0

Have Spirit o
920369d0

Have Kagening
92036ad0

Have Graveyar
92036bd0

Have All-seei
92036cd0

Have Hero of
92036dd0

Have Doma The
92036ed0

Have Life Eat
92036fd0

Have Dark Gra
920370d0

Have White Ma
920371d0

Have Kamionwi
920372d0

Have Nightmar
920373d0

Have Spirit o
920374d0

Have Supporte
920375d0

Have Trial of
920376d0

Have Dream Cl
920377d0

Have Sleeping
920378d0

Have Yamatano
920379d0

Have Dark Pla
92037ad0

Have Ancient
92037bd0

Have Faith Bi
92037cd0

Have Orion th
92037dd0

Have Ansatsu
92037ed0

Have La Moon
92037fd0

Have Nemuriko
920380d0

Have Weather
920381d0

Have Octobers
920382d0

Have The 13th
920383d0

Have Charubin
920384d0

Have Mystical
920385d0

Have Fiend’s
920386d0

Have Witty Ph
920387d0

Have Mystery2
920388d0

Have Dragon S
920389d0

Have B.eye Si
92038ad0

Have Toad Mas
92038bd0

Have Spiked S
92038cd0

Have Flame Ma
92038dd0

Have Chronolo
92038ed0

Have Wind Dji
92038fd0

Have Phantom
920390d0

Have Temple o
920391d0

Have Monster
920392d0

Have Sinister
920393d0

Have Lord of
920394d0

Have Akihiron
920395d0

Have Rhaimund
920396d0

Have The Melt
920397d0

Have Dokuroiz
920398d0

Have Fire Rea
920399d0

Have Larvas
92039ad0

Have Hard Arm
92039bd0

Have Firegras
92039cd0

Have Man Eate
92039dd0

Have Dig Beak
92039ed0

Have M-warrio
92039fd0

Have M-warri2
9203a0d0

Have Tainted
9203a1d0

Have Lisark
9203a2d0

Have Lord of
9203a3d0

Have The Judg
9203a4d0

Have Mysterio
9203a5d0

Have Ancient
9203a6d0

Have Darkfire
9203a7d0

Have Dark Kin
9203a8d0

Have Spirit o
9203a9d0

Have Big Eye
9203aad0

Have Armaill
9203abd0

Have Dark Pri
9203acd0

Have Hurricai
9203add0

Have Ancient2
9203aed0

Have Fire Eye
9203afd0

Have Monsturt
9203b0d0

Have Claw Rea
9203b1d0

Have Phantom2
9203b2d0

Have Arlownay
9203b3d0

Have Drk Sha2
9203b4d0

Have Masked C
9203b5d0

Have Lucky Tr
9203b6d0

Have Genin
9203b7d0

Have Eyearmor
9203b8d0

Have Fiend Re
9203b9d0

Have Gate Dee
9203bad0

Have Synchar
9203bbd0

Have Fusionis
9203bcd0

Have Akakieis
9203bdd0

Have LaLa Li-
9203bed0

Have Key Mace
9203bfd0

Have Turtle T
9203c0d0

Have Terra th
9203c1d0

Have Doron
9203c2d0

Have Arma Kni
9203c3d0

Have Mech Mol
9203c4d0

Have Happy Lo
9203c5d0

Have Peguin
9203c6d0

Have Petit Dr
9203c7d0

Have Frenzied
9203c8d0

Have Air Marm
9203c9d0

Have Phanton3
9203cad0

Have Mabarrel
9203cbd0