Because of an oversight, the Fast Ball, which is supposed to work better on Pokémon that have a proclivity to flee, only works as it should on Magnemite, Grimer, and Tangela. This is because the Ball is supposed to look for three categories of Pokémon: ones with a 10% flee rate, ones with a 50% flee rate, and ones with 100% flee rate. However, for some reason the ball only chooses the first three Pokémon in the first category (10% flee rate) when it applies its catch-rate modifier.