Roselia evolves into roserade with a shiny stone.
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in order to evolve Roselia you have to use a sun stone on it You use a shiny stone, not a sun stone.
All you need to do to evolve a Roselia is use a shiny stone on it. No trading, and it will never evolve on it's own no matter what level you get it to.
Shiny Stone
A Shiny Stone will evolve a Togetic into a Togekiss or a Roselia into a Roserade.
Roselia only evolves in Pokemon platinum, diamond, and pearl Roselia evolves into roserade if you use a sun stone on it