Game ⇓ | Flavour Text ⇓ |
| Red/Blue | 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. |
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| Gold | It raises its big ears to check its surroundings. If it senses any thing, it attacks immediately. |
| Silver | Quick to anger, it stabs enemies with its horn to inject a powerful poison when it becomes agitated. |
| Crystal | It is easily agitated and uses its horn for offense as soon as it notices an attacker. |
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| Ruby/Sapphire | NIDORINO has a horn that is harder than a diamond. If it senses a hostile presence, all the barbs on its back bristle up at once, and it challenges the foe with all its might. |
| Emerald | Its horn is harder than a diamond. If it senses a hostile presence, all the barbs on its back bristle up at once, and it challenges the foe with all its might. |
| FireRed | It is easily angered. By swinging its well- developed horn wildly, it can even punch through diamond. |
| Leaf Green | An aggressive POKéMON that is quick to attack. The horn on its head secretes a powerful venom. |
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| Diamond/Pearl | It has a violent disposition and stabs foes with its horn, which oozes poison upon impact. |
| Platinum | It has a violent disposition and stabs foes with its horn, which oozes poison upon impact. |
| Heart Gold | It raises its big ears to check its surroundings. If it senses anything, it attacks immediately. |
| Soul Silver | Quick to anger, it stabs enemies with its horn to inject a powerful poison when it becomes agitated. |
| Black | It has a violent disposition and stabs foes with its horn, which oozes poison upon impact. |
| White | It has a violent disposition and stabs foes with its horn, which oozes poison upon impact. |
