I want Water Arcanine to have a reverse-Extremespeed move (i.e., an attack like Vital Throw) called "Big Kahuna", a 110-power lower-priority Water move. He should also have Hurricane in his movepool, based off of his name and synergizing with the Water type, his original/actual name, and Rain Dance strategies.
I'll repeat it here, but Alolan Exeggutor having a solitary Mega where each head gets its own long neck is on my wishlist.
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I sortaaaa had the idea of separate forms for different forms for pokemon from different locations a long time ago, as I dreamed up an Electric/Flying version of Talonflame (get this: from another dimension, due to what I inferred into the pokemon world off the fan speculation of mega evolutions being unique to the XY +/- ORAS world due to various sayings of Zinnia) with different stats. (The idea was that there was a "dystopian" dimension where all sorts of pokemon were variously different: for instance, Rayquaza's native form was his dark shiny form as we know it, and he went by the name "Darquaza" instead of Rayquaza. Talonflame was a special pokemon, as it represents the peregrine falcon, which is ubiquitous throughout the world, with my fanon stating that was Talonflame or its counterpart was in fact ubiquitous through all worlds.)
Yup: such a convention would've almost given me infinite ability to mess with and/or reintroduce fixed things in the pokemon world for my fanfiction. Back before the English name for Serperior was known, while its Japanese name of "Jalorda" was, I had been pulling for the name "Coilord".
That said, regional variants do much the same thing for Pokemon fanfiction authors.