N
Charizard (and theoretically, Moltres) are Flying and Fire types and thereby command total domination in a fight with Paras or Parasect, whose types are Bug and Grass.
This set of match-ups is the only one where both of a particular Pokemon's types are aligned perfectly against its opponent. Movesets, however, only express one type at a time. This leaves us two other pairs:
Golbat with Wing Attack and Air Cutter vs. Paras/Parasect with Bug Bite or Fury Cutter and X-Scissor;
Omastar with Rock Throw and either Ancient Power or Rock Slide, vs. Charizard with Ember and Flamethrower or Fireblast. Note that only certain Omastar from prior to the moves update still have Rock Throw, however.
Pairs with less-than-total elemental domination are more common. There are two notable configurations you might want to keep an eye out for:
Paras or Parasect with two Bug moves versus Exeggcute or Exeggcutor with a Grass-type charge move;
Magnemite or Magneton with two Electric moves versus Gyrados with up to two Dragon-type moves (which, like a Rock/Rock Omastar, is no longer possible on new specimens)
For reference, the list of double-weaknesses is:
Bug: Exeggcute, Exeggutor
Electric: Gyarados
Fire & Flying: Paras, Parasect
Water: Rhyhorn, Rhydon, Geodude, Graveller, Golem, Onix
Grass: Rhyhorn, Rhydon, Geodude, Graveller, Golem, Onix, Omanyte, Omastar, Kabuto, Kabutops
Ice: Dragonite
Rock: Butterfree, Scyther, Charizard, Moltres, Arcticuno
The list of double-resistances is:
Bug: Charizard, Moltres, Zubat, Golbat, Ghastly, Haunter, Gengar
Fighting: Mr. Mime, Butterfree, Scyther, Zubat, Golbat, Weedle, Kakuna, Beedrill, Venonat, Venomoth
Flying and Steel (surprising overlap here due to Steel Wing): Magnemite, Magneton
Grass: Butterfree, Scyther, Dragonite, Charizard, Moltres, Zubat, Golbat, Paras, Parasect, Weedle, Kakuna, Beedrill, Venonat, Venomoth, Bulbasaur, Ivysaur, Venusaur, Oddish, Gloom, Vileplum, Bellsprout, Weepingbell, Vectrebell
Ground: Butterfree, Scyther, Paras, Parasect
Ice: Dewgong, Cloyster, Lapras
Poison: Nidoking, Nidoqueen, Rhyhorn, Rhydon, Geodude, Graveller, Golem, Onix, Ghastly, Haunter, Gengar