- Mine Golem
- Mine Mole
- Mira the Star-Bearer
- Mirage Dragon
- Mirage Knight
- Mirror Ladybug
- Mobius the Frost Monarch
- Mogmole
- Mokey Mokey
- Monster Cat
- Monster Tamer
- Montage Dragon
- Moon Dragon Quilla
- Moonlit Papillon
- Morinphen
- Morphing Jar
- Morpho Butterspy
- Morphtronic Boomboxen
- Morphtronic Celfon
- Morphtronic Datatron
- Morphtronic Lantron
- Morphtronic Magnen
- Morphtronic Magnen Bar
- Morphtronic Radion