)
That would likely depend on how canon to pokemon biology the breeding mechanics are, do pokemon go through estrus cycles? game mechanics suggest pokemon can mate and reproduce at any point, that might suggest they're capable of mating for pleasure, but that might just be for convenience sake
Dolphins are supposedly known to mate for fun, so maybe Pokemon can too
Obviously ||Porn logic suggests they do, but then porn logic suggests a lot of things that may or may not be true for pokemon||