Use the following CDs to create secret monsters:
 
Disc Type Monster
Ace Combat 4 Game Desert Karakarakkung
Armored Core 2 Game Robot
Chrono Cross (Disc 1 or 2) Game Strange Fenril
Digimon World Game Forest Hare
Final Fantasy Games Game Fairies
Front Mission 3 Game Sea Octipee
Gungriffon blaze Game Moochi
Lunar: The Complete Silver Story (Disc 1) Game Desert Hengar
Lunar: The Complete Silver Story (Disc 2) Game Legendary monster
Monster Rancher 3 Game Moochi
Spyro: Year Of The Dragon Game Ice Gitan
Suikoden 2 Game Forest Raiden
Tekken Tag Tournament Game Wrestling Moochi
Fantasia 2000 DVD Joker
Magnolia DVD Frog
Men Of Honor DVD Merman
Bob Dylan: Greatest Hits Music CD Marin
Kenny G: The Moment Music CD Something mysterious [Note]
Dave Grusin Music CD Koronit
Train: Drops Of Jupiter Music CD Robot train
Note: Grampa Bragman will have to do research on the monster before you can get it.
Game Shark Codes
Master Code (Must Be On) ECBCA14C 14318EDC
Infinite Money 1CA24054 144F25CC
Player 1 Codes
Infinite HP 4CA2CCC8 1456E4044CA2CCCE 1456E404
No HP 4CA2CCC8 1456E7D74CA2CCCE 1456E7A5
Max Def 4CA2CCD0 1456E404
Max Int 4CA2CCCC 1456E404
Max Pow 4CA2CCC6 1456E404
Max Spd 4CA2CCCA 1456E404
Player 2 Codes
Infinite HP 4CA2D1A0 1456E4044CA2D1A6 1456E404
No HP 4CA2D1A0 1456E7D74CA2D1A6 1456E7A5
Max Def 4CA2D1A8 1456E404
Low Def 4CA2D1A8 1456E7A6
Max Int 4CA2D1A4 1456E404
Low Int 4CA2D1A4 1456E7A6
Max Pow 4CA2D19E 1456E404
Low Pow 4CA2D19E 1456E7A6
Max Spd 4CA2D1A2 1456E404
Low Spd 4CA2D1A2 1456E7A6