Red: An aggressive POKéMON that is quick to attack. The horn on its head secretes a powerful venom.Yellow: Its horns contain venom. If they are stabbed into an enemy, the impact makes the poison leak out.Gold: It raises its big ears to check its surroundings. If it senses any thing, it attacks immediately.
Prof. Lotus' Notes: The name is a portmanteau of the Japanese borrowed word for Needle - ニドル (Nedoru), cnidocyte (thing in all poisonous animals) and rhino. The rina aspect is attributed to European languages like Italian or Spanish where o denotes male names.