Pet Mod Name: Regional Forms
Pet Mod Concept: Self-explainatory: we start a brand new literation of Regional Forms for existing Pokémon, some who can have their own exclusive evolutions.
Explanation: A fusion of the original two, which I elaborate here:
A legal submission must include at least one stage as a Regional Form, who can then either have a New Stage Evolution (

to

) or a Replacement Evolution (

to

rather than Paldean

).
Regional “counterpart” to existing Regional Evolutions — which as of late are

,

,

,

,

,

and

— are not allowed. This also applies to accepted New Stage/Replacement Evolutions.
You also cannot submit an evolution of the original counterparts even if their regional variants have one. (Ex. Johtonian

/Hoennian

is invalid)
Pokémon that are already part of three-stage evolutionary line (i.e. Pichu to Raichu, Cleffa to Clefable) are not allowed to received a New Stage Evolution; they are only eligible for a Replacement Evolution. (Ex. A Regional Form Pikachu may instead evolve into a Gorochu, rather than a Regional Form Raichu further evolving)
Existing Regional Forms are ineligible for submission. (Ex. You cannot add a New Stage Evolution to

or

a Replacement Evolution to

; You are, however, allowed to have a New Stage Evolution/Replacement Evolution on, ex, Alolan Trubbish)
"No more than +/- 30 in any single stat. You cannot increase a Pokemon's higher attack/defense if the difference between both attacks/defense is more than 50. [...] You may swap a Pokemon's stats before modifying them, but the gap rule still applies to the new higher stat."
New Stage Evolutions can have up to six new Moves that their pre-evolution(s) cannot learn. If you decided to give it a new Type and that the Pokémon was single-typed, then ten extra Moves (preferably for STAB and/or flavor) will be added.
Original branched evolutions can each receive a New Stage Evolution as long as it respects the conditions required for one. Otherwise, it’s Replacement Evolutions instead. A New Stage Evolution or Replacement Evolution can be branched as well, but no more than two branched evolutions per line.
For Flavor/Design, be sure to give Height and Weight to all Regional Forms; Weight is especially important as it involves moves like Low Kick and Grass Knot.
Not every canon Regional Form with BST below 485 and are single-stage or stage 1 evo needs a New Stage Evolution. Things like

and especially

will go overkill with a New Stage Evolution. The rest that would be compatible for a new evolution are fine.
Replacement Evolutions follows the same rules as standard Regional Variants (Same BST), but with a new name instead of “[Regional Pre-Fix] Pokémon”, and be sure that the design is drastic from the original evolution.
Due to taking place in NatDex (where Mega Stones and Z-Moves can be used), no Move goes “unusable”. In addition, custom move/ability variations are permitted (Ex. A Fairy-type Fake Out, or a Sp. Atk lowering Intimidate). However, entirely new mechanics are banned (Ex. An Ability that sets up a permanent Trick Room; a move that crits if it is not-very-effective); any custom must be derived from GF's Gen IX toolbox.
You may vote for up to 6 lines per slate, each person is allowed 1 self-vote for every two other submissions, though it cannot be your first choice.
Miscellaneous: Current council is just me, and coders are more than welcome to join.
Any additional thoughts are welcome.