Those legendary players are the ones that score hattrick even when they are 18-yrs old 4 star. I got one before, I trained him till 8 star between 18-21, 7 stars between 22-24, and he raked in 70++ every seasons. But I stopped playing after that so he never reached 1000goals. Keeping his main stat above 200.

If you simply pick a random player, I wouldnt know.