It might be about an emperor in the Johto kingdom in the Pokemon universe. It could involve power struggles, as perhaps other regions or powerful trainers are vying for control of the Johto kingdom. It may also explore the local Pokemon species that are unique to this area and how they interact with the emperor and his subjects.
Well, in many fanfictions, Ash's training before going to Johto can vary greatly depending on the author's imagination. Sometimes it's intense and focused, while other times it's more laid-back and includes unexpected adventures.
Well, it could involve Ash using his Pikachu in some really creative strategies to defeat tough opponents. Maybe he finally overcomes his rivals like Gary in a more intense rematch in the Johto League.
There could be a group of rivals rather than just one. A team of young Johto trainers who idolize the previous Johto League champions. They see Ash as a threat to their dreams of following in their idols' footsteps. They might gang up on Ash during battles or try to sabotage his journey in more subtle ways, like spreading false rumors about him in the Pokémon Centers. This would force Ash to not only focus on his Pokémon training but also on his reputation management.
One highlight was the intense Pokémon matchups. Ash's Pikachu facing off against Gary's Pokémon was exciting. Another was Ash's strategic use of his Pokémon's moves. He showed great skill in choosing when to attack and when to defend.
He might encounter rare Pokémon that are unique to the Johto region, like Chikorita or Cyndaquil as his starter. He could also face off against the infamous Team Rocket, who always seem to be up to no good in the Pokémon world.
It could be a new character created specifically for the fanfiction. A trainer with some super - rare and powerful Pokémon that Ash has never faced before. This trainer might have unique battle tactics that really test Ash's skills.
The Ash vs Gary Johto League full battle was a clash of two great trainers. Gary, being a tough competitor, brought out some powerful Pokémon. However, Ash had trained hard. His Pokémon like Bulbasaur and Charizard also contributed significantly. The battle had many twists and turns. Ash's ability to adapt to different situations during the fight was what made the battle so exciting. He learned from his previous encounters and applied that knowledge well in this battle.