You do not need to provide a Canadian PCC with the application. If IRCC determines that you need a finger-print based check later on, they will will request it.
If you have not spent a cumulative 6 months in your home country since turning 18, you technically do not need to provide the PCC for that country, but you should provide a letter of explanation (VOs will normally expect the PCC from the home country and may reject the application as incomplete if they don't find it, so best to provide the LOE). Keep in mind that it is IRCC's right to ask for one anyway, and they sometimes do.