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Let me get this straight
>Pecharunt serves the old couple by feeding its mochi, which are poisonous in nature and draw out the greed of the old couples.
>Pecharunt starts fullfilling their request, in hope that they will love it even more, eventually lead to the whole mask situation.
>Pecharunt then loses everything to Ogerpon.
So Pecharunt sealed its fate by itself? The couple has already loved it without condition, but because of the toxic, they became greedy which lead to Pecha's demise.