Since you guys seem to know a ton about the game, maybe you can help me out.
First Question:
The movepool for ash greninja on Smogon is only the first one, using Hydro Pump/Surf, Dark Pulse, Water Shuriken, Spikes.
Why does it even use Water Shuriken, only becaues of it's increased Priority (I am aware of Grens ability)? I am just a bit surprised because it only has a base power of 60 once it turns into Ash Greninja and it's already a very fast Pokemon, so it seems to me that Surf instead of Water Shuriken could be of more use? That way you have 2 water attacks but one is more powerful if you know Surf is not enough, but Surf is the safe choice if you know it is enough.
Second Question:
Would you ever think it's viable to use 2 Mega Pokemon? I am aware you can only evolve one, but for example Mawile-Mega and Alakazam-Mega could offer you a powerhouse in either Special Attack or Attack, depending on what you need more. And if you notice you need one over the other you use them, but both are still very strong in their normal form. Of course you could just use another physical attacker, but the Mega-Evolution makes them insanely strong, so I am just wondering if that would be worth to consider.