The strongest gym leader starts by beating up Gary.

[Flashy Larvitar] [Gym Leader with High Status from the Start] [Taking Apprentices] [Male Lead is Sexually Capable] [Multiple Female Leads]
Having traveled through the Pokémon world for over a decade, Fang Yuan awakened the strongest Gym Leader System. As long as he develops gyms and trains disciples, he can earn rewards!
On the very first day that Fang Yuan inherited the position of dojo master, a young man named Xiao Mao, who drove a sports car, led a whole cheerleading squad, and had a smug look on his face, walked into the dojo.
"You're the gym leader? You don't seem that strong, do you?"
[A qualified disciple has been detected. The host has helped correct Xiao Mao's thinking. The host will be rewarded with a quasi-god-level spirit egg.]
Looking at the arrogant and haughty Xiao Mao, Fang Yuan chuckled.
"Let me show you what it means to be outmatched by others, and to be in a world beyond your understanding."
. . . .
[The host helped disciple Sabrina control her emotions and received a reward: Superpower]
[Host helped disciple Ash become a Pokémon Master, reward: 1 free Bond Phenomenon Pokémon to choose from]
[The host has trained multiple champion-level disciples and has received the following rewards: Rainbow Feather and Creation Tablet.]
As Fang Yuan took in more and more disciples, their strength grew stronger and stronger.
Fang Yuan suddenly discovered one day.
"Huh? How come all the league champions are my students?"
Pokémon, Pocket Monsters, Pokémon