>>52493841if i had to guess with no knowledge of the engine they use.
Things are loaded that don't need to, stay loaded, and are never unloaded when they are far out of the view of the players view that use up resources.
Like I swear that there are pokemon that spawn under the map and fall endlessly and never load.
Like my clip i saved, I doubt gamefreak ever thought mons could spawn in areas they can't and fall off the maps, never unload and are constantly taxing the system causing the memory leak