What happens when you put one of Pokémon’s strangest mechanics under a mathematical microscope? In the first video of the LabX × adef series, adef investigates the math behind Pokérus, the rare virus that can infect Pokémon in the games. By digging into the numbers and mechanics behind it, the video turns a weird piece of Pokémon lore into a much bigger exploration of probability, math, and what happens when you follow a gaming question as far as it can go.