Pokemon ending would be the darkest timeline ;-;
Imagine reaching the 12th generation, every Fire-type starter fulfilling the vague Chinese Zodiac "rule". We seemingly reached the end, graced every major continent, country, area, what-have-you, seemingly leaving no real estate to explore for regions for Gens 13 and beyond...
Suddenly, new Starter types are introduced that aren't your standard Grass, Fire, and Water types, instead following a new elemental triangle, Steel, Ground, and Ice, and now the Ice-type Starters based on the modern day Horoscope. South Africa and Madagascar, Brazil and Peru, Chile and Argentina, Canada and Alaska, Italy, Russia, Greece, the list goes on. No land left uncharted. Just new beginnings and new ways to milk the Miltank. You bet your ass they
will find a way to continue the franchise.
The near-infinite amount of unused modern-day animals, extinct animals, cryptids, urban legends, fairy tales, and even references to
speculative biology works are still on the table. We could go all the way up to Gen 11 and
still have no Peacock or a Dolphin, or even a dedicated mosquito! And before you bring up Buzzwole, we have different foxes, sharks, squirrels, raiju, etc., and Buzzwole is an anthro mosquito anyway!
Huh... Haven't gone on a tangent this long in a while...