We can discount that Meowth though; You and your mother had just moved to Alola, so of course she'd have a non Alolan Meowth.
Okay, sure. Two things, though.
First, this just supports my point of
"a Japanese meowth finding its way to Alola and breeding and co-populating with the local variant". If we as foreigners can import a foreign meowth, why can't anyone else? Furthermore, when the baby of a breeding pair is all but solely dependent on the mother's species, why would it be hard to believe that several female Japanese meowth couldn't mother a co-species of meowth in the region, or even just on an island?
That may be a bit complex for what Game Freak has planned, though. So my second, and perhaps the more important point: Why a Meowth? Of the literal hundreds of pokémon the mother could have as a 'companion', why would Game Freak give her a Meowth? Why does it even have to be a foreign import? Why couldn't
Mom have caught it after we moved there? Both your and my arguments are speculation, we simply don't have enough facts at this time, and this was point that I was trying to make;
"We've already seen X in-game, so Y can't happen." isn't a conclusive argument, it's an assumptive one. I'm assuming that because Mom appears to have a Meowth-K, that Meowth-K co-exist with Meowth-A. This is not a conclusive statement, but that does not make the opposite true, either. For all we know, that model could have been a place-holder because they didn't want the Alolan forms to be shown at E3.
I'm sorry you find the argument "stale". I still think it's highly unlikely that Pikachu, Exeggcute, and Cubone will have Alola forms.
The argument of "We've already seen X in-game, so Y can't happen" is getting quite old at this point...
...It's just that, this argument has become stale, and it has yet to be conclusively proven or disproven.
The argument that I was saying was stale should be clear by now, if it wasn't before. The fact that this argument is built on the same basis that the No-Mega crowd has built their arguments on should show just how stale it's become. All I'm asking is to come up with something new.
I'm personally of the opinion that Exeggcute will not get an Alolan form. Everything about Exeggutor-A fits within the lore of what an Exeggutor could be, even in the lore that existed before this point, so there's no real reason to change Exeggcute accordingly. In fact, I'd say that the fact that if Exeggutor-A is what an Exeggutor is supposed to be when it can grow in its natural environment, and can therefore grow to meet its full potential, is a rather interesting piece of information. This alone almost directly points to a biological or evolutionary connection between the Dragon and Psychic types that goes beyond the type chart.
That said, I can't see why, evolutionarily speaking, Cubone and Persian would
not, in fact, change as well; if Marowak, as an organism and as a species, changed to adapt to it's environment, how could it do so without changing from birth and across generations? Remember, Marowak is the adult, and Cubone is the baby, and that's the way it will always be. To say that Cubone, or even Pichu, Pikachu, or Exeggcute, will not have Alolan forms, and to state it as an absolute fact runs counter to just about everything that we can expect from any news cycle like the one that we're in now. It's like saying that Rowlett, Litten, and Popplio won't evolve to be Grass, Fire, and Water types respectively, because guess what, we haven't seen their evolved forms yet, despite generally knowing what we can expect from them, even if we don't know
what that is yet.