Multiple Pokemon have two x4 weaknesses:
Magcargo, Wormadam (Bug/Grass), Sewaddle, Swadloon, Leavanny, Geodude, Graveler, Golem, Onix, Rhyhorn, Rhydon, Larvitar, Pupitar,Aron, Lairon, Aggron, Probopass, Shieldon, and Bastiodon
Paras and Parasect have a x4 weakness to Flying and a x4 weakness to Fire. If they have the Dry Skin ability that x4 Fire weakness becomes a x5 weakness.
Rhyperior has a x4 weakness to Grass and Water, although the Solid ROck ability reduces the damage it takes from Super Effective attacks.
