Finding where you can catch a Nincada can be quite tricky in Pokemon Shiny Diamond and Shiny Pearl. Finding a Nincada isn't as easy as going to the nearest tall grass, but why would you want a Nincada. Unlike Absol, he does not have a high attack. Nincada however evolves into two very strong Pokemon, Ninjask and Shedinja. Ninjask has the highest speed among all non-legendary Pokémon of Sparkling Diamond and Shinning Pearl and Shedinja has the Wonder Guard ability. Let's first see where you can find Nincada.
Where to Catch Nincada
Nincada won't appear until you beat the Elite Four and acquire the National Dex. After getting the National Dex, you can find wild Nincadas in Eterna Forest. You will also be able to find a Shedinja in Eterna Forest. Using Pokeradar will help you find a Nincada. You can get the Pokeradar from Professor Oak in Sandgem Town.
How to get Ninjask and Shedinja
Once you get a Nincada, you will need to level up to 20 and have an open party slot with a Pokeball. Indeed, when a Nincada evolves, it transforms into two Pokémon instead of a normal Pokémon. Once your Nincada evolves, you will have both a Ninjask where the Nincada was in your party and a Shedinja in your party's previously vacant slot. If you don't have a free slot in your group, you risk losing the Shedinja.
With this, you will have filled three slots in your National Dex and have two very interesting Pokémon to use for your team. As mentioned earlier, Ninjask has the highest speed of any non-legendary Pokemon in the game. This means that in battle, Ninjask will normally attack first. This can be very useful for clearing debuffs before something happens to Ninjask.
You also have Shedinja who has the Wonder Guard special ability. Wonder Guard means that Shedinja will only take damage from super effective moves against him. Being a bug/ghost-type Pokémon means that Shedinja will only take damage from flying, rock, ghost, fire, and dark moves. Since Shedinja only has 1 HP, that means he will die from any damaging moves of these types. However, immunity to 13 of the game's 18 move types is exclusive to Shedinja. If you're having more trouble finding a specific Pokemon, be sure to check out our other guides.
Shiny Diamond Pokémon and Pokémon Shining Pearl are only available on Nintendo Switch.