- Gearspring Catapult
- Gearspring Exploder
- GEM Burst
- Gemini Imps
- Genesis Crisis
- Genghis Ghan the Emperor Dragon
- Genin
- Gentlemander
- Gernia
- Gestalt Trap
- Ghost Gardna
- Ghost Salvage
- Ghoul Summoner
- Giant Axe Mummy
- Giant Flood
- Giant Germ
- Giant Hunter
- Giant Orc
- Giant Racket
- Giant Rat
- Giant Red Seasnake
- Giant Rex
- Giant Scorpion of the Tundra
- Giant Soldier of Stone