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Usually found in rivers, Nidoeon keeps its body submerged, while keeping its eyes and ears above the surface. Due to its coloration, most will not see it. When prey is spotted it lunges surprisingly fast, landing a venomous bite.

Nidoeon underwent a spontaneous mutation and grew fins and gills that allow them to live underwater. It is adept at sending foes flying with harsh tackles using its tough, scaly body.