Reddit user lava172 posted this on r/pokemon and it kind of blew my mind.

You know the move "Milk Drink", beloved signature attack of Miltank, Pokemon's most-nipply creature? I've never realized it can be used to heal team members outside of battle. Pretty sweet, right?...

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BUT, it saps HP away from the Pokemon performing Milk Drink in the process. Implying that one of your beloved monsters is literally sucking the life out of the other one through its teat. WHAT. NO. Intellectually, I understand all that changed was two numbers but I can't get the horrifying image of interspecies raw suckling out of my brain now.

 

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Oh, and apparently they addressed this in the anime.

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Game "Freak" is right.