If PCRA relief is granted and you are granted a new trial, then you may file a suppression motion. The PCRA process is difficult, however, and it's difficult to get relief. You would have to prove numerous factors are present. (see Blog article below which outlines PCRA).
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After the PRCA is filed the court will consider the facts and possibly have a hearing. If you win that (and, unfortunately for you, it is a big if) then you may get a new trial or another form of relief.
If you get a new trial, you get a redo of the entire trial. That means you can file any trial motions, re-question and depose any witnesses, and hold the whole trial all over again. It is truly a second bite at the apple.
Best of luck,
Shannon K. McDonald