Sylveon it's actually pretty easy. The harder ones are Espeon or Umbreon
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Getting Happiness up is super easy. Just leave them at the front to battle. They usually evolve around level 30 if you treat them well. [spoiler]I legitimately got a level 6 Lucario in Platinum.[/spoiler]
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I know, I got my Espeon in HeartGold at 26, the harder way doesn't mean that way it's actually hard