First, you start off with a Budew. It evolves into Roselia when it gains a lot of happiness. Then, Roselia evolves into Roserade with a Shiny stone. You get the Shiny stone on Iron Island. Go through all the battles and a guy will give you a Riolu egg if you have space in your party. Then, when you exit the cave, there will be a pokeball on the ground. Pick it up, and it will contain a Shiny stone.
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You use a Shiny Stone on Roselia to evolve it into a Roserade.
Shiny Stone
it dos not evolve by leveling up you need a shiny stone. {'-'}
A Shiny Stone will evolve a Togetic into a Togekiss or a Roselia into a Roserade.
budew evolves into Roselia and Roselia evolves into roserade. i don't know what levels they evolve at