I know that drowsy power affects the number of Pokémon that show up, but does it affect the rarity of Pokémon?
For example, you need a Snorlax strength of Master 4 to find Raichu in Greengrass Isle, but once you reach it, does it matter if my sleep score is 1 or 100? Will I be equally able to find that Raichu regardless of my drowsy power?