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Roserade would easily be a contendor but the bouquets are overly simplified. Roselia had much more detail in the flowers. If Roserade looked like pic related I bet so many more people would like it. Roserade is one of my favorites but even I can't ignore that flaw. I still prefer it to Roselia, though.
Popplio3 looks fantastic and easily among the top.
Never considered Absol or Arceus to be "beautiful" Pokemon, I like you OP.
Gardevoir and Milotic are top.
Meloetta is just another generic shortstack, can't see the appeal.