Your Pokémon will constantly grow fond of you as you play Pokémon Brilliant Diamond and Brilliant Pearl. Higher affection comes with additional bonuses, such as a Pokémon that scores a critical hit or survives a fatal attack against an opponent. But if you want to make the game more difficult, you can lower your affection with a Pokémon. Here's what you need to do to reduce a Pokémon's affection in Pokémon Brilliant Diamond and Brilliant Pearl.
It's about the happiness of your Pokémon. We recommend that you reduce your Pokémon's happiness as much as possible to reduce their affection. The best way to do this is to essentially feed them as many negative herbs as possible, such as medicinal herbs, powder, energy herbs, and awakening herbs. You can also make your Pokémon pass out over and over again, but it's a much longer process.
After doing this enough times, you shouldn't notice bonuses appearing that often. We recommend that you keep several of those herbs in your inventory to make sure you don't smell them. Lowering Pokémon's affection level is not a common practice, but some players have expressed interest in making the original Diamond and Pearl games look like the previous experience in a remastered game.