What type combination is the most offensive?

Question

for example
Normal/Flying

offensive against:
grass,fighting,bug

Answer 1

Ice/Fighting is Super Effective on 347 Pokemon.
However, since no Pokemon has this type combo, Ice/Ground (the Mamoswine line) would have the most Super Effective coverage with 342 Pokemon hit for Super Effective damage.

There are some type combos with no or very few Pokemon resisting.
Dragon/Fire (only resisted by Heatran w/ Flash Fire)
Dragon/Ground (only resisted by Skarmory, although Shedinja is immune to this)
Fighting/Dark (only resisted by Heracross, Croagunk, and Toxicroak)
Fighting/Ghost (nothing resists this)
Ice/Electric (only resisted by Magnemite, Magneton, Magnezone, Rotom-H, and Rotom-F)
Fighting/Rock (Hits 338 Pokemon for SE damage and is only resisted by 11 Pokemon)
Rock/Ground (only resisted by Breloom, Torterra, and Virizion)
Water/Normal (Only resisted by Empoleon, Dialga, Giratina, Frillish, Jellicent, Ferroseed, and Ferrothorn)
Fighting/Flying (only resisted by five Pokemon)
Ground/Flying (only resisted by eight Pokemon)

Comments

Ice / Electric is why Rotom-F should be a very potent threat in RU.

Answer 2

A ground-ice type due to it covering 10 diffrent types. I would do a ground-fighting type, but there are none of those. An example of a ice-ground type would be Mamoswine.

Comments

Actually, it only covers 9 different types.
And Ground/Fighting is pretty bad offensive, since the two types overlap in terms of coverage.