You know how in a previous question you said you were going to update the coverage checker with things like Motor drive etc well I made a list for you to save some time.
Dry Skin: Immune to water +50% Damage from Fire(so like half super effective): Paras, Parasect, Croagunk, Toxicroak, Jynx.
Flash Fire: Immune to Fire: Vulpix, Ninetails, Growlithe, Arcanine, Ponyta, Rapidash, Flareon, Houndour, Houndoom, Heatran, Litwick, Lampent, Chandelure, Heatmor, Cyndaquil, Quilava, Typhlosion, and Entei.
Lightning-rod: Immune to electric(I will only list the ones who are not ground types): Electrike, Manectric, Blitzle, Zebstrika, Pikachu, Riachu, Goldeen, Seaking, Zapados, and Pichu.
Motor-drive: Electric-immunity: Electivire, Blitzle, Zebstrika, and Emolga.
Sap-Sipper: Deerling, Sawsbuck, Boufallant, Marill, Azumarill, Girfarig, Stantler, Miltank, Azurill, Blitzle, and Zebstrika.
Storm-drain: Water immunity: Shellos, Gastrodon, Finneon, Lumineon, Lileep, Cradiliy, and Maractus.
Volt-absorb: Electric immunity: Jolteon, Chinchou, Lanturn, Raikou, and Pachirisu.
Water-absorb: Water Immunity: Poliwag, Poliwhirl, Poliwrath, Lapras, Vaporeon, Politoed, Wooper, Quagsire, Mantine, Mantyke, Frillish, Jellicent, Chinchou, Lanturn, Suicune, Cactnea, Cacturn, Tympole, Palpitoad, and Seismitoad.
And then you already have Wonder Guard. I hope I helped :)
P.S. Wow the bolt beam combo is less effective then I thought XD