>>57325101The moves and the type chart are all that matters when it comes to a type's viability. The # of good Pokemon in a type has no bearing on whether the type is good or bad. For example, Rock is an objectively shit type, perhaps the worst in the game, yet it has Garganacl and Tyranitar. Meanwhile Fairy, objectively the best type in the game, is filled with shitmons like Granbull, Mr. Mime, and Aromatisse.
Also, Araquanid is OU because of Sticky Webs. It's an otherwise very middling Pokemon that has achieved stardom due to 1 move that's exclusive to Bug types (and Smeargle).