>>38779764All of those end of world plots villains from other regions have affected Kanto, flooding along the shorelines from Kyogre’s rain, newly formed deserts from Groudon, spots where space and time aren’t quite right because of the Sinnoh incident, the north has glaciers and tundras from Ghetis’s ice age plot, Ultra Wormholes are opening across Kanto, etc. and it’s all introducing Pokémon species from all the other regions into Kanto by force
Basically it’s someone’s job to try and clean up all the messes the Legendaries have made and you’re there to help.