I think that Pokemon like Charizard, Lucario, and even Mimikyu are horribly overrated. It makes me sad that some of the less popular Pokes don't get enough love, like Darkrai.
I happen to love a bunch of Pokemon that seem to get no love, like Venusaur (people always seem to like only Blastoise or Charizard for some reason). I also think pokes like Scolipede and Mienshao are underrated, since they're such great competitors and have great designs!
All the branding flagships are overrated, pikachu, charizard, lucario, jigglypuff etc. etc.
I like the really cool pokemon that everyone forgets like dragalge (one of my favs). Theres bound to be others but I can't think of any since I haven't played pokemon in a year...
I feel as if Golisopod is very underrated. It's pretty much associated with Guzma, and that's pretty much it. If you know how to use Emergency Exit, that thing can be a beast! Plus, I just love giant isopods.
most of unova's pokemon are super underrated. i can't get myself to call any pokemon overrated because i love them all so much and i'm glad they make people happy
are overated 
