In Generation 4, Pokémon saw multiple new evolutions for pocket monsters that were added from older generations. One of those new Pokémon added in Diamond and Pearl was Roserade, the evolved form of the Hoenn Pokémon Roselia. To no one’s shock, Roserade is back for the remakes of Diamond and Pearl. Here’s what you need to do to evolve Roselia into Roserade.
To have Roselia evolve into Roserade, you will need a particular item in Pokémon Brilliant Diamond and Shining Pearl. This item is called a Shiny Stone, and this stone is much like Moon, Water, and Fire Stones needed to evolve Pokémon such as Clefairy and Eevee. Shiny Stones can be obtained in several ways, including through finding one that is on the ground.
Once you have a Shiny Stone, make sure to add a Roselia to your party. Go to your bag, and find the Shiny Stone. It should be located in the Other Items pocket. Select it with A, and then pick the ‘Use this item’ option. Click on the Roselia in your party, and you should see that the item is compatible, which means that the Shiny Stone can be used on Roselia.
After that’s done, all you have to do is watch the evolution cutscene and see your Roselia turn into a Roserade.