At least it gets slightly stronger for each sacrifice
Prevent all damage done to this Pokmon by attacks during your opponents next turn
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It severely weakens their ability to react and then takes them out some other way while they are in a weakened state
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Second, you have to try really hard to actually make a Pokmon dislike you, as just levelling up the Pokmon and walking around with it in your party will keep steadily increasing its friendship over time, while to decrease its friendship by any substantial degree would require you to intentionally get it KO'd over and over