>>59054248What he means by regional gimmick is typically defined as "mechanic appears as a status quo changer, but is written out by the next generation and only revisited when that generation gets a new tie-in game in the future, along with spin-offs and the anime"
Mega Evolution is the original example. It's introduced with a big special button, and is prominent throughout the generation, particularly within the story. Mechanically, it's the most limited because it's limited to specific Pokémon and requires an item to use outside of Mega Rayquaza and Let's Go. Thematically, it seems like a no-brainer, a further stage of evolution, but more like a super form rather than a sequential next stage. As an example, if there was a Mega Charmeleon, it would look more like a super powerful Charmeleon than Charizard or a Charizard parallel, like how Mega Floette doesn't look like Florges. Mega Evolution would continue to be used throughout Gen VI and VII (not that Gen VII really did anything with it), and returned in PLZA, and Primal Groudon/Kyogre are basically the same thing.
Z-Moves replace the Mega Evolution button in Alola games. Mechanically, they're more balanced by being usable by all Pokémon, though some get signature Z-Moves. However, Z-Moves are specific to Alolan characters.
Dynamax/Gigantamaxing is the next regional gimmick and removes the held item requirement of Z-Moves while some Pokémon get unique forms and moves. It's specific to the Galar region and will definitely be used in Legends 3. Masters has to bring in Eternatus to allow Dynamaxing in its region, but don't expect it to be like Mega Evolution.
Terastallizing is the most recent regional gimmick.
Double battles have been a part of practically every Pokémon game since they were introduced. You'd have a point with triple battles if they were ever featured prominently in the story in any capacity.
