The problem with using SLV as an example is that you're using evidence from the dub to argue about how things happen in the Japanese version.
Just something else, I hate it when I make a theory and within a few hours something comes out an proves me wrong, lol. I had a closer look at the trailer, seems like Ash-Greninja is actually like a pseudo-ME in the sense that it's activated in battle, meaning it's not permanent. When Ash calls Greninja to use "Waterfall" (we'll say it's that for now) it's a regular Greninja to start, then you see the red glow and transformation happen. I'll be damned...
EDIT: Once again I take too long and someone beats me to it. Sigh...
Just something else, I hate it when I make a theory and within a few hours something comes out an proves me wrong, lol. I had a closer look at the trailer, seems like Ash-Greninja is actually like a pseudo-ME in the sense that it's activated in battle, meaning it's not permanent. When Ash calls Greninja to use "Waterfall" (we'll say it's that for now) it's a regular Greninja to start, then you see the red glow and transformation happen. I'll be damned...
EDIT: Once again I take too long and someone beats me to it. Sigh...