What combination of 2 of these types has the best coverage?

By “best coverage” I mean the most Pokémon they are Super effective on. I am doing this for my Greninja as it has Protean and everything is STAB. The types are:

Water (Move Surf/Waterfall)Dark (Move Dark Pulse/Night Slash)Ice (Move Ice Beam)Grass (Move Grass Knot)Psychic (Move Extrasensory)Rock (Move Rock Slide)Flying (Move Aerial Ace)Ghost (Move Shadow Sneak)

Pleaselog inorregisterto add a comment.

As far as I can tell:

Rock & Water

No Effect 0Not Very Effective 10Normal Effectiveness 476Super Effective 288

But Grass/ Rock would give more super effectives as well as more not very effectives.

No Effect 0Not Very Effective 34Normal Effectiveness 381Super Effective 359

If you want a full set then:

Rock SlideWaterfallShadow SneakPower-up Punch

No Effect 0Not Very Effective 0Normal Effectiveness 277Super Effective 497

Source - type coverage chart

First, I would like to tell you,Rock Slide and Aerial Ace are awfully weak, even with STAB. They needn’t to be included on a such Pokémon as Greninja.However, I counted them while searching, and found out that the combinationGrass/Rockhas the mostSupereffectivehits, scoring 327 Pokémon hardly hit. However, you will hardly see Rock Slide and Grass Knot on the frog, anyway, and a least abnormal set would involveIce Beam, Surf, Dark Pulse and U-Turntogether. but if you want to play the supereffective key, go forHP {FIRE}, Surf, Grass Knot and Ice Beamand you’ll score 444 Super Effectives. Furthermore? There isGrass Knot, Ice Beam, Power-Up Punch and HP {GROUND} which is simply awful but scores 528 Supereffective, but I strongly not recommend it.I hope this helps.

~ Sincerely yours, Blitz.