Johnny's guardian bakugan.
He has no wings, one head, a long neck, four feet, one tail, and 10 spikes. Each spike can shoot out water. There is a horn on his head.
- Tatil Wave! ( Mentro creates a tidal wave by swinging his tail )
- Coiling Defense! ( Mentro coils his body like a snake, hardening his skin )
- Aqua-Spike! ( Mentro blasts water from his 10 spikes, that attack the opponent )
- Tail Wash! ( Mentro swings his tail, sending blast of water at the opponent )
- Blasting Shield! ( Metro brings his body together, like a snake coiling with water blasting from his 10 spikes )
- Aqua Charge! ( Mentro points his head down as he charges with a field of water around him )