Some authors have suggested that Pokémon change its long-standing rival structure by making the player the rival of another trainer, who adjusts their team based on the Pokémon and tactics the player frequently uses. This is merely a conceptual idea for the series' gameplay, not a new game or mechanic announced by Game Freak.
From the early arrogant rivals like Blue and Silver to the more friendly Hop and Nemona, the personalities and relationships of rivals with the protagonist have evolved over the years, but their basic role has remained similar: to actively challenge the player and drive the protagonist's journey. The author believes this dynamic has become stale and thus proposes a role-reversal design.
In this concept, the opponent would also collect Gym Badges, explore the region, and challenge the Pokémon League, sometimes beating the player to important milestones or capturing rare Pokémon, ensuring the game world no longer revolves solely around the player's achievements. Their team would not grow along a completely predetermined path but would instead adapt by observing the lineups and strategies the player frequently employs.
For example, if the player relies on Fire-type Pokémon, the opponent might train Water-, Rock-, or Ground-type Pokémon; if the player favors strong physical attacks, the opponent may add defensive Pokémon or moves that inflict status conditions. The author also envisions gradually locking certain party slots, allowing rivals to form long-term bonds with signature partners while leaving other slots open for players to experiment with different combinations.
The author believes that this design, centered around competitive progression, adaptive opponents, and team management, is better suited for Pokémon spin-off titles rather than directly replacing the existing formula of the main series.