I'm Lucy, and I'd be happy to answer your questions today.
The courts don't put free forms online for something like this. Motions to Quash are rarely used, and courts don't really want to encourage people to file them in response to every discovery request, which is a danger if anyone could download the form, fill it out, and file it. I did find a site that will sell you a template for $18.00, if you're interested. However, I've found a sample motion that might be helpful. Be sure to look at the Certificate of Service at the end, because you'll need that.
This one was filed in federal court, so you wouldn't use the law from it, but it can help to see formatting.
Look carefully at Superior Court Rule 9A. If this particular motion is not filed as an Emergency Motion, you must send it to the other party before filing, wait for the response, and file both the motion and the response together. But if you frame the motion as an emergency (as the first example does), that's not required.
Massachusetts also has an extensive law library system. You can visit the law library for the county where your case is located, and they will have books on how to quash subpoenas. Those books will have forms that you can copy and use to create your own motion.
This document also has some helpful information on motions to quash.
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