Pokémon: the Strongest Legend

He traveled through time and became the original protagonist, the strongest NPC trainer who appeared without player intervention. If there was no player intervention, how strong would the protagonists in the past be? And will the eldest brother who has traveled through time as the protagonists be beaten up by the protagonists of previous generations? Without player intervention, where would these protagonists go? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.