First off, I know there are some people who want a certain mon out/wonder why it's still in, but trust me on this, it won't be here too much longer lol. Anyways, Hippowdown is a pure ground type and evolution of Hippopotas, as far as design goes it's basically a hippo that has sand pouring out of its back, all in all the design I find to be very average. However, Hippowdon is a really good pokemon to use in both competitive & in game playthroughs (although I've never used it myself) , as it has great stats, solid abilities (best ability being sand stream that it has access to) and has a pretty solid movepool. Overall, Hippowdon is by no means a bad pokemon, and I still like it, but just isn't really appealing to myself so that is why I ranked it here.
