Pokémon Red Version, Blue Version, and Yellow Version - Chance of Running in Wild Battles
In a wild Pokémon battle, if the current Speed of the Pokémon trying to run is equal to or greater than the opposing Pokémon’s, running is successful. Otherwise, the formula below is used.
X=int(A*32/B)+(30*C)
where:
- A = Current Speed of Pokémon trying to run
- B = Remainder of (D / 4) divided by 256 where D is the current Speed of the opposing Pokémon. If B equals 0, running is successful.
- C = Number of times the player already tried to run this battle, not counting the current attempt. Doesn’t count attempts to run when an effect (such as Mean Look) prevents the Pokémon from running. This variable is reset to 0 when the player chooses the Fight command, but doesn’t change when the player’s Pokémon changes.
If X is greater than 255, running is successful. Otherwise, if a random integer from 0 through 255 is less than or equal to X, running is successful. Otherwise, running fails.