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Placing a Poison Shroom in a paperization block has entirely positive outcomes for results, 3 being the tiers of healing Mushroom (regular, Shiny, and Flashy, with noticeably Flashy being its most common output sticker), and the last potential result the ungodly rewarding 3x Shiny Leafs, which yields a net positive coin gain of 148 coins.
It might be near-useless in combat, but that didn't stop me from carrying one or two around for upgrade block results...
Unofficial Sage of The Denpa Men board (Awaiting the sequel: http://i48.tinypic.com/20gmued.jpg) 3DS FC: 1590-4884-9269 | Apparently a PM:SS ''know-it-all''