Now that HOME has updated for Z-A, I can scratch my head about this. I suppose I can’t necessarily expect TPC to be as pedantic about sequencing alternate forms as I am, but prior to this update, the way that Megas, G-Maxes, and regional forms were sequenced seemed like it had some logic to it:
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Gigantamax forms come before Megas
In my head, this makes sense — Gigantamax is arguably less substantial of a transformation than Mega Evolution, as it doesn’t alter the stats or type or Ability, just the appearance, in addition to replacing Max Moves with G-Max Moves. So even though Mega Evolution was
introduced first, I sort of understood why G-Maxes were
listed first. Related to that…
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Gigantamax forms come before regional forms and other forms that can’t Gigantamax
Again, I feel like this makes sense. Only Kantonian Meowth can Gigantamax, and only cap-less Pikachu can Gigantamax, so even though Alolan Meowth and Pikachu’s cap forms were introduced first, it makes sense to have their Gigantamax forms closest to the forms that they actually branch off from. And then, as with Megas, you could say that regional forms are more of a substantial change than Gigantamax, being almost akin to new evolution lines altogether in many cases. Cap Pikachu is similar, as it is meant to be one very specific specimen of Pikachu, separate from what typical Pikachu are able to achieve. (Although funny enough, Ash’s Pikachu in the anime
can Gigantamax.) Next up…
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Mega Evolutions come before regional forms
Based on what we have already established, this also makes sense. Any regular Kantonian Slowbro can Mega Evolve, but Galarian Slowbro cannot. Furthermore, Mega Evolution is only a temporary transformation, whereas regional forms are fixed and unchangeable. So once again, the more substantially distinct a form is from its “base,” the further back it’s listed. However…
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With the Z-A Megas, they seem to have shifted to a pure “order of addition” approach
Here we see Mega Raichu X and Y come
after Alolan Raichu, which cannot Mega Evolve and which distances the Megas from the form of Raichu that actually can. And Greninja is a similar case to some of the previous ones: any old Greninja can Mega Evolve, but only Greninja’s second, obscured form with the Battle Bond Ability can transform into Ash-Greninja (and I guess we don’t yet know if “Greninja-1,” as the Battle Bond-having form is designated in the code, can Mega Evolve, although obviously the distinct Ash-Greninja form itself has been revised Sovietly.)
One could certainly argue that this “order of addition” approach is a lot simpler, more straightforward, and more objective… and I would even agree with that! But without going back to adjust the earlier examples, it just feels inconsistent.