In the same way, when a planet is moving retrograde at the time of your birth, you will experience that planetary function in a different way than if it was in direct motion at your time of birth. Also, to clarify the meaning of the word 'transiting,' a transiting planet refers to the planet's position by degree and constellation in the sky during the time period referenced. That would mean that the planet Pluto's current position in the sky is making some sort of key contact with the person's birthchart. In this sense, stations carry the most 'oomph' of all. If you have a copy of your birthchart, retrograde planets are typically noted with an 'R' or 'Rx' beside them.
Some people have no retrograde planets natally, some have a few, others still have four or more.
Two retrograde planets is the average. Speaking from my own personal and professional experience, the one thing I can say for sure is that the energy of that planet is more pronounced than if it were direct. If the planet is stationary at the time of birth, or at significantly reduced speed, it is even more pronounced. That is, retrograde and stationary natal planets function at the extreme ranges of their expression. Retrograde and stationary planets have heightened energy and the state of retrogradation can alter or divert the energy of a planet from its normal expressions.