Misdreavus has the tools to both immediately break through defensive checks and threaten with a sweep afterwards; it can only be dealt with offensively. It is a generically strong enough mon both in terms of utility + offensive presence to be useful against any opposing team, warranting its presence on the vast majority of teams outside of a few specific archetypes, to a degree that is well beyond any other non-reactive mon. These traits make it disproportionately influential in the builder to the point where the meta revolves around its presence