From the Super Mario Wiki
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Megaflash is an immensely powerful and large sticker variation in Paper Mario: Sticker Star. Their background is similar to that of Flashy stickers, though the rainbow stripes go sideways and the colors aren't as sharp. They are the exact opposite of Big Shiny stickers in trying to find them; they are only found hidden in a few levels instead of primarily in shops. All Jump and Hammer stickers have a Megaflash variation. Megaflash stickers are so large that only two can fit on a single Album page.