Roselia doesn't necessarily need a soothe bell to evolve, but yes it would increase the happiness level of Roselia which is one of the requirements. The additional requirement for Roselia to evolve is that you must give it a shiny stone during the day.
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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.
it dos not evolve by leveling up you need a shiny stone. {'-'}
if you want to evolve budew you will need to make it happy and it has to be daytime. if you then wnt to evolve your Roselia into a Roserade, you have to give it a shiny stone
sfull happiness. give it vitamins, level it up, give it a soothe bell, and let it win battles. it should take about a week at least.
A Golbat evolves from Zubat at level 22. To evolve Golbat into Crobat, you need to keep it in your party, give it pokeblocks, allow it to battle, etc. as it evolves from friendship. to make it easier for you give it a soothe bell he will bond with you quicker