Roselia can be found only in Ruby/Sapphire, on Route 117. Unfortunately you can't. Roselia can't be caught in the wild in Emerald. With that being said, it may be possible in a copy of Ruby or Sapphire, and you could trade it over. Otherwise, you're pretty much sunk.
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you cant catch roselia in emerald, but I'm pretty sure you can catch it in Sapphire, so just trade it over
Roselia, Bellossom or Sceptile.
You have to trade with Ruby or Sapphire to get a Roselia.
Budew is the pre-evolved form of Roselia. However, it is not introduced in Emerald, it is introduced in the 4th Generation games
You cannot get a Yanma in Pokemon Emerald, as only Hoenn Region Pokemon can be found in Pokemon Emerald.