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.
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There is no specific level that a Budew will evolve at. However, if you level it up on high happiness, you will end up with a Roselia. And if you use a Shiny Stone on the Roselia, you will get a Roserade.
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.
Pachirisu does not evolve :(
Level 10
level 25