[@ianzerep]
1. Again, perma-STAB is largely a facet of Ninjutsu, rather than Hidden Strike; the "no weakness" scenario was covered in the move description:
[quote]selecting a random valid type to deal damage as if multiple types are valid for this purpose; 4x type weaknesses are prioritised first, followed by 2x type weaknesses if the target has no 4x weaknesses, and then by types which the target does not resist if they also possess no 2x type weaknesses[/quote]
In other words, if the Pokemon is one of those rare ones which has literally no weaknesses at all, Hidden Strike's type is just a random type derived from one of the types the target doesn't actively resist, i.e. 1x damage is dealt as far as weaknesses go.
2. Priority attacks of notable strength do exist, and can be used effectively by plenty of Pokemon, especially given that three of Mega Greninja's moves now lack STAB. Also, focus sash.
3. Uh, alright. Thanks, I suppose. I'm kind of wondering why nobody else has put their 'mons in the Characters tab yet, myself.