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You can't remove or lower it. But honestly, the stat boosts aren't really gamebreaking.
>At affection level 2 and higher, a Pokémon will gain 1.2 times the normal experience from battles.
>At affection level 4 and higher, a Pokémon can sometimes:
>Avoid attacks, even when they have 100% accuracy. This can activate multiple times per turn.
>Endure attacks that could otherwise make it faint and survive with 1 HP (including confusion damage). This can activate multiple times per turn.
>Shake off status conditions at the end of the turn.
>At affection level 5 and higher, a Pokémon can sometimes:
>Have higher chance of critical hits.
>An affection level of 2 or higher is also a prerequisite to evolve Eevee into Sylveon. The other requirement is that Eevee must know a Fairy-type move when it levels up.
>There are some cases where Pokémon do not get their affection bonuses, however. If a Pokémon Mega Evolves, it will not gain any affection benefits while it is in its Mega-Evolved state. More broadly, battles conducted over wireless or online play, or at the Battle Maison or Battle Institute, do not incorporate any affection benefits. If a Pokémon is asleep when the opponent faints, the ability to pet it afterwards will be disabled, but all other effects remain in place.
