Clearly, Abomasnow is better. Even though Roselia has a wide move pool and can use status and recovery attacks, Abomasnow is also an ice type! Not only can you use SolarBEam but you can also use Blizzard. And by breeding, you could get a perfect Abomasnow!
Here is my Abomasnow's moveset: Blizzard(TM)
Leaf Storm(Chain Breeding)
Water Pulse(TM)
SolarBeam(TM)
Hope this helps!!!!!!!!!!!!!!!!!!11
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you cant get abomasnow in pokemon black/white
You have to trade with Ruby or Sapphire to get a Roselia.
Well catch a fire type Pokemon like Ponyta train him to what level the Abomasnow is and use fire as I found out that his strongest weakness is Fire if you want to find out more info about Abomasnow search on Google 'Pokemon Marriland Abomasnow Platinum'
You use a Shiny Stone on Roselia to evolve it into a Roserade.
Roselia evolves into roserade with a shiny stone.