Hello, a group of four of us will be visiting Boston in July and one is not vaccinated, what kind of test does that person need to take in order to go, because I have heard of regular covid test and pcr test. thank you

As far as Im concerned you do not need to take any tests. Some stores/restaurant will require masks whether you are vaxed or not so everyone should bring a mask. Your friend who's not vaxed should already wear a mask at least indoors both for their and everyone else's safety.

As of June 2022, no vaccinations are required here.

I don't believe you need any, but you should continue to monitor the guidance!