It may not come to mind too often, but the Pokémon games have always had a ton of mysteries and secrets tucked within them. Some turned out to be merely rumors, like the infamous Mew under the truck ...

Pokemon Brilliant Diamond & Shining has a limited amount of evolution items for you to get in-game. Here is How to Get the Dawn Stone, Razor Claw, Razor Fang, Dragon Scale, King's Rock, Dusk Stone, ...

According to its Pokédex entry, it evolves into Roselia when certain conditions are met, and then Roselia can evolve into Roserade when exposed to a Shiny Stone.