Pokémon Brilliant Diamond and Shining Pearl offer a profusion of evolutionary items that players can use to evolve a particular Pokémon. The Dubious Disc, in particular, is used to evolve Porygon2 into Porygon-Z.
With that in mind, we have prepared a handy guide that talks about where to find the Dubious Disc in Pokémon Brilliant Diamond and Shining Pearl.
Where to Find the Dubious Disc
In Pokémon Brilliant Diamond and Shining Pearl, you can find the Dubious Disc evolutionary item on Route 225. Once you reach Route 225, head towards the side of the lake north to the house, and you will find yourself a Dubious Disc.
However, make sure you have the TM95 item as you will need it to travel across deep water bodies.
How to Get TM95
You can get the TM95 item in Celestic Town from Cynthia’s grandmother. You will find her inside the ruins in Celestic Town once you have defeated the Galactic Grunt. When you locate her, give her the Old Charm, and in return, you will get the TM95 item.
Pokémon Brilliant Diamond and Shining Pearl are currently available on the Nintendo Switch platform.