In Gen 1, the critical hit probability is calculated as T/255. For a High critical-hit ratio move T is:
Since Parasect's base speed is 30, T = 120. That means it's only a 47,06% chance. Any Pokémon whose speed is equal or lower than 65 won't have a guaranteed crit.
I know, I'm pointing at an extremely small inconsistency that affetcts an extremely low number of Pokémon (15) in an extremely niche meta. But I think it's nice that the calc works properly in these situations anyway.
In Gen 1, the critical hit probability is calculated as T/255. For a High critical-hit ratio move T is:
Since Parasect's base speed is 30, T = 120. That means it's only a 47,06% chance. Any Pokémon whose speed is equal or lower than 65 won't have a guaranteed crit.
I know, I'm pointing at an extremely small inconsistency that affetcts an extremely low number of Pokémon (15) in an extremely niche meta. But I think it's nice that the calc works properly in these situations anyway.