The "sacred crest" of the Cobble Kingdom happens to look like a penant of sorts, or a flag. Like so:
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It can be figured out manually by following instructions found within the maze on the Isle of Ruins, in it's southwestern quarter. Just follow the stone tablets that you'll find there, and pay attention to the number of stars & directions shown on each tablet! The stars are that tablets placement in the sequence (there are five of them).
Hope that helps.
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In the last boss, the crest is an hourglass. But, if you mean the other crest, it's the Triforce.
If you meant on Phantom Hourglass, you close your DS. I knew how to do that when I was 7.
You craft a piston with 3 wood on the top row, cobble stone-iron ingot-cobble stone in the middle row, then cobble stone-redstone-cobble stone on the bottom row. Lastly, you put a slime ball above the piston in the crafting table, and voilà! You have your sticky piston!
the first time you go to the temple symbol door the crest is an hourglass, the second time it is the tri-force triangle, picture of tri-force triangle here: http://upload.wikimedia.org/wikipedia/commons/thumb/8/86/Triforce.svg/512px-Triforce.svg.png
You need the cobble badge.