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Potions are described as man-made, so I assume they're chemical, and as such would give off unnatural scent/taste. Animals don't like to get chemicals on themselves and actively resist taking medicine or supplements unless a human they trust is coaxing them into it, so I would think that a wild Pokemon would get a whiff of potion and think "fuck, that ain't part of the forest, I'm out of here before it hurts me". Ever used a spray bottle or aerosol around a pet and had it freak the fuck out because something is hissing and spitting at them? Living in a world where many types of Pokemon can throw poison/sleep powder or stun spore at you, and then expecting a wild creature to innately understand the difference between dangerous attacking spray and beneficial healing spray is kinda ridiculous.
