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Bolster + Blister
(A bolster is the sturdy pillow placed under a softer one to strengthen it. The verb "bolster" itself means to bulk up or fortify. A blister is a blister.)
Combination of "Pillow", based off its appearance and Fairy typing, and "marionette" based its slight puppet-like appearance, and its ability to "pull the strings" off other pokemon using Parting shot.