This is the ancient feudal era before humans established the Pokémon Alliance.
No rules, no league laws, no unified trainer system
Pokémon = weapons of war, private property of nobles, cornerstone of royal power
Separation of the country, separation of royal powers, hereditary nobility, fiefdom autonomy
Conquests between countries, private wars between lords, knights vying for merit, and powerful ministers dividing their empires
Whoever has stronger elves will have land, power, title and destiny.
Pokémon is not a partner system, it is military power, combat power, and title capital.
The strong sealed the territory and split the land, while the weak became serfs, refugees and died in the battlefield.