"C Rank: Reserved for Pokemon that have notable niches in the RU metagame, but have just as notable flaws that prevent them from being effective. Pokemon in the C tier often require significant support to be effective in RU. C rank Pokemon tend to face a lot of competition with the more commonly used Pokemon." I would argue that Golem fits under this category, facing lots of competition. I don't think it belongs in D rank because it can run an effective lead set in RU.