As I've read, the speed of Pokémon with the Quick Feet ability will not be reduced if they get paralyzed.
But what happens if my Pokémon with Quick Feet loses its ability (like, with Skill Swap)?
Will my Pokémon's speed get x2 its original value if I cure its paralysis?
Or does the game know if my Pokémon's speed stat got halved initially because of paralysis and return it to the original speed in case its true?