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"Pick clean the bones of Pokémon caught in the sea or stream. Thank them for the meals they provide, and pick their bones clean. When the bones are as clean as can be, set them free in the water from which they came. The Pokémon will return, fully fleshed, and it begins anew."
One would guess that that folklore is the most widely known story from Sinnoh's Canalave City library. The Pokédex has also stated several times that some Pokémon possess the ability to produce food items, or regrow body parts they discard. So forget the implications of snacking on your Pokémon's body parts, and focus on the exquisite taste instead!

Stuck somewhere with nothing to eat, with an inventory full of loot and hunger points that keep dwindling down until your eventual doom? Worry not and count on your pals for emergency snacks, at least until you can find a way back! Or even if you just enjoy eating them, no judgment.
Your Pokemon models also change accordingly when you get their items, so you might feel horrible looking at pincerless crab Pokemon walking around but hey, at least you got a good meal out of it!

Last Resort also allows you to benefit from even more Pokemon through datapacks! Use any tools on any Pokemon, to get any items you'd like. Everything is fully datapackable! (DATAPACK GUIDE COMING SOON)