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Say hello to the squad of Jankillers, the finest anti-bullshit pokemon I can come up with.
To maximize their usage, I need them with HP low enough to be restored fully by a berry juice,so they can be used twice in a single fight.
This is where these reverse candies come in handy. They' were introduced in reborn to bring down the level of your own pokemon if they go over the level cap, but they have other uses. You can use them instead of a move relearner to get a move you missed out on, or for... this purpose.