Pokémon: Who let him leave Pallet Town?

Traveling through the Pokémon world, Natsume obtains the Pokémon Research System, where he can research special Pokémon and receive rewards.
So, Natsume became the Pokémon development master:
Tokiwa Gym - "Itaki, you're asking me to fight Mewtwo. You're not a human being, are you? I'm not a human being either. Come on, Rotom the Sludge Truck, use Big Bang!"
Fengyuan Conference - Divine Beast Man: "Your three Digletts fired three Earthshatters at once. These are clearly three Digletts. You cheated!"
Natsume: "You're talking nonsense. What's wrong with my split personality?"
"Go ahead, Bangilas, use intimidation!"
"Banlas!! (If you dare to win, my 100,000 minions outside the arena will break your trainer's legs!!)"
The protagonist travels with Xiaozhi, and is expected to travel to all regions in the future.
The protagonist is a master of Rotom development—Pokeball Rotom, Electric Toy Rotom, Mecha Rotom...

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