PharmCAS GPA - takes the average grade (between/among retaken classes) in the gpa calculation. However, both grades are shown on the actual application.
PCAT - If you've taken it more than 3 times (it maybe be 4?), you will have to write a letter to the test administrator for why you should take the test again. However, I highly advise people to take the test when they're ready...shop around for good prep guides, because they're definitely out there (I can recommend a few).