Question

Which combo of types gives the most coverage?

Comments

Um, what do you mean exactly?

As in party Pokemon's types? Or in a Pokemon's Moves?
If you mean Party Pokemon, I'll answer your question.

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Single pokemon!

Answer 1

Ice, Figthing, Ghost and Ground gives the best coverage, dealing at least neutral damage to every Pokemon.
Source: http://pokemondb.net/tools/type-coverage

Answer 2

Fire, Grass, Water, Electric, Psychic/Ghost, Flying.

I've put this as in if you were choosing a party, which types you would choose. :)
Sorry if I misinterpreted your question. xD

Comments

Only four types. I meant a single pokemon.