I've wondered this too. Interesting responses hmm, i think i understand better now. Personally I'm a big fan of smogon. I don't feel like any of their decisions on bans are unreasonable or unjustified considering they make their decisions based on facts and statistics rather than base them on opinions. I do think it's unwise to just copy smogon sets all the time because you really limit yourself and as others have said, smogon doesn't always have the best sets on their website. I don't think Smogon does their job of creating a fair competitive environment perfectly, but they do it better than anyone else who i've seen try. Certainly better than i can do. 718 pokemon is a lot to work with, and seeing all these creative tiers on pokemonshowdown where almost every pokemon in the game has a chance is very impressive and great to see! I don't like when people complain that their pokemon gets moved to another tier where it belongs. It's not like you can't use that pokemon anymore, just use it in a fair environment. Your mega kangaskan will still perform well in ubers, don't worry.
I found cleffa in route 2 at night when training. I'm doing a monorock run of this game and posting it on youtube check it out here https://www.youtube.com/playlist?list=PLy4A1R4doTvBvKvruv8ckD78PBWpU_2yi Rock isn't a common type people do monotype runs with but i've really enjoyed it so far. My team is all geodudes right now o.O