It's been only over a decade since the grand revolution happened in Unova. The change that Team Plasma called "Pokemon Renaissance". Since Team Plasma's first birth, they have been an utter effective organization that bent the Unova to their own will and of course to their own glorious goal to make Unova reach it's deserved fate. A region of peace and solitude. A region where Pokemon and humans are truly equals and not just slaves to humans. No being deserved that fate. No human, no pokemon, nothing. The only way to live in harmony and peace, only way to end the Pokemon cruelty lied on removing "trainership". Which eventually did happen of course. On paper, there was no trainers left and no Pokemon used for the sake of human deeds.
Unova was indeed a better place on surface. Unemployment was over the roof before Plasma. Who needed humans to carry goods when a Sawk, Throh or a Conkeldurr can do it. Who needs any plane, ship when flying, water pokemon can do that for free?