Gyro Ball did 95% to a basically perfect max HP torn from defensive Ferro.

0 Atk Ferrothorn Gyro Ball (150 BP) vs. 252 HP / 0 Def Tornadus-Therian: 186-219 (51.3 - 60.4%) -- guaranteed 2HKO

Dunno if the formula got busted somehow but testing with ferrothorn it was ohko other pokemon

Tang Roll: 59 - Possible damage amounts: (58, 60, 60, 61, 61, 63, 63, 64, 64, 66, 66, 67, 67, 69, 69, 70) - 0 Atk Ferrothorn Gyro Ball (72 BP) vs. 252 HP / 48 Def Tangrowth: 58-70 (14.3 - 17.3%) -- possible 6HKO

Cinderace: 168 - Possible damage amounts: (97, 98, 99, 100, 102, 102, 104, 105, 106, 107, 108, 109, 111, 111, 113, 114) - 0 Atk Ferrothorn Gyro Ball (150 BP) vs. 0 HP / 0 Def Cinderace: 97-114 (32.2 - 37.8%) -- 95.8% chance to 3HKO

Pult: OHKO/317 - Possible damage amounts: (195, 196, 199, 201, 204, 205, 208, 210, 213, 214, 217, 219, 222, 223, 226, 229) - 0 Atk Ferrothorn Gyro Ball (150 BP) vs. 0 HP / 0 Def Dragapult: 195-229 (61.5 - 72.2%) -- guaranteed 2HKO

Hi there,

This looks like the same problem as Issue 20836, where it was found that Gyro Ball is not respecting its limit of 150 base power, and increasing beyond this if the speed difference is sufficient. This seems consistent with your findings, where the only instance of damage within range was when the base power was under 150.

The internal team has been made aware of the issue, thanks!