| 1 | Red, Blue | An aggressive Pokémon that is quick to attack. The horn on its head secretes a powerful venom. |
| 1 | Yellow | Its horns contain venom. If they are stabbed into an enemy, the impact makes the poison leak out. |
| 1 | Stadium | Its horn is harder than diamond. If it punctures an enemy, it pumps powerful venom into the wound. |
| 2 | Gold | It raises its big ears to check its surroundings. If it senses anything, it attacks immediately. |
| 2 | Silver | Quick to anger, it stabs enemies with its horn to inject a powerful poison when it becomes agitated. |
| 2 | Crystal | It is easily agitated and uses its horn for offense as soon as it notices an attacker. |
| 2 | Stadium 2 | It raises its big ears to check its surroundings. If it senses anything, it attacks immediately. |
| 3 | 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. |
| 3 | 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. |
| 3 | FireRed | It is easily angered. By swinging its well-developed horn wildly, it can even punch through diamond. |
| 3 | LeafGreen | An aggressive Pokémon that is quick to attack. The horn on its head secretes a powerful venom. |
| 4 | Diamond, Pearl, Platinum | It has a violent disposition and stabs foes with its horn, which oozes poison upon impact. |
| 4 | HeartGold | It raises its big ears to check its surroundings. If it senses anything, it attacks immediately. |
| 4 | SoulSilver | Quick to anger, it stabs enemies with its horn to inject a powerful poison when it becomes agitated. |
| 5 | Black, White, Black 2, White 2 | It has a violent disposition and stabs foes with its horn, which oozes poison upon impact. |
| 6 | X | It raises its big ears to check its surroundings. If it senses anything, it attacks immediately. |
| 6 | Y | An aggressive Pokémon that is quick to attack. The horn on its head secretes a powerful venom. |
| 6 | Omega Ruby, Alpha 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. |
| 7 | Let's Go, Pikachu!, Let's Go, Eevee! | Its horn contains venom. If it stabs an enemy with the horn, the impact makes the poison leak out. |
