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I've added some AOE moves and also that information about Roselia. If there are any other hordes that give out 2 EVs please let me know.
I've decided not to include Hoppip because I don't want to turn the guide into a list of ALL EV training possibilities, because the reader can easily look that up.
I included Roselia and kept Psyduck in there because Roselia is worth 2 points and Psyduck is on the same route which is very efficient.