Is it neccessary to have water/dark moves on a Protean Greninja?

Question

The way I see it, because of Protean, Greninja doesn't really need water or dark moves to provide STAB damage, because all his moves are guaranteed STABs.
Is there a legitimate build that does not include water and dark type moves?
If so, what would it be?
I'm eyeballing a special attacking set including Mat Block. Please help or correct me if my idea is invalid.

Answer 1

No it isn't.

Greninja gains STAB from all moves so it's not necessary for greninja to have a water/dark move. There are viable sets without them, but just say that you want to got greninja after switching into a fire type move (not recommended as greninja is very frail) you won't be able to hit them without a water type move. But Dark move can be skipped as switching into a psychic hit keeps it immune and you can just STAB U-Turn it (works well only on physical greninja due to special greninja most likely will not be able to KO a psychic type at full HP)

So the best set if you want to include mat block on special greninja would be to include dark pulse and hydro pump/scald/surf. And greninja works well without a dark move when used physical as shadow sneak is a good option instead so that you can evade a fighting move or potential high jump kick.

Hope I'm clear :)

Comments

Yes, thank you. I think I'll carve out a slot for matblock where dark pulse was.

Greninja-water/dark
Ability- Protean
Nature-timid
Ev set- 252 special attack, 252 speed, 6 hp
Item- expert belt
Moveset-
~Matblock, fighting, status
~scald, water, 80/100, special attack
~icebeam, ice, 90/100, special attack
~extrasensory, psychic, 80/100, special

Answer 2

Yes
Let's say you're in this situation;
Greninja used Dark pulse, so he turned in to a Dark type
Venusaur used Giga Drain - restored health

So it's worth getting it, to not get hit by super effective attacks.

Comments

This situation would work with any move beside Ground, Rock, or Water so this doesn't apply to just Dark type moves....