Pokeball Snap Tab
These little snap tabs are pretty basic. There’s a PDF template to cut the red vinyl applique, a “color” (which you can just stitch in black) to stitch the placement line, black stitching for the outline, and then white stitching (after you’ve put the back piece on).
If you want to make the red a fill stitch instead, that’s easily done with Ink/Stitch. If not, the file contains all the formats Ink/Stitch can currently put out.
This is copyrighted by Silver Seams in the year noted in its URL, and licensed under Creative Commons’ CC-BY-SA. This basically means you’re free to sell items you make from it, provided you give reasonable attribution, and that if you modify it you’re required to share your changes with the world under the same license (the actual legal bits are in the link).
This is a fan work, not licensed or endorsed in any way, so it’s up to you to get any other permissions you need from the IP owner.
As with other free embroidery patterns here, the SVG file is included in the ZIP package so you can modify it in Inkscape and produce your own variations/sizes/etc.