You can't evolve roselia. Its evolution was made in gen 4.
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I don't think Roselia evolves in Pokemon Sapphire, but i do know that it evolves in Pokemon Diamond and Pearl. If I'm wrong please do tell ASAP. Thank You.
You have to trade with Ruby or Sapphire to get a Roselia.
You use a Shiny Stone on Roselia to evolve it into a Roserade.
budew evolves into Roselia and Roselia evolves into roserade. i don't know what levels they evolve at
Roselia only evolves in Pokémon Platinum, Diamond, Pearl, HeartGold and SoulSilver. In order to evolve Roselia, you have to use a Shiny Stone on it, it doesn't evolve by any level.