From StrategyWiki, the free strategy guide and walkthrough wiki

• Mist Dragon
• Octomammoth
• Ant Lion
• Mom Bomb
• Scarmiglione + Skullant(x4)
• Scarmiglione
• Baigan
• Cagnazzo
• Dark Elf + Dark Dragon
• Magus Sisters: Cindy, Sandy + Mindy
• Barbariccia
• Calcobrena
• Golbez
• Doctor + Barnabas
• Dr. Rugae
• Rubicante
• Asura
• Leviathan
• Demon Wall
• Odin
• Behemoth
• Bahamut
• Elemental Lord
• CPU + Attack Node + Defence Node
• Storm Dragon
• Gigas Worm
• Master Flan + Black Flan(x2) + White Mousse (X2)
• T-rex
• Death Mech
• White Dragon
• Dark Bahamut
• Plague
• Lunasaur(x2)
• Ogopogo
• Zeromus