Roll 20d600: 485, 128, 577, 263, 70, 267, 325, 266, 71, 445, 229, 209, 279, 79, 172, 561, 232, 536, 79, 248
Step One
Tyranitar used Iron Head!
Crit [1-25/600]: 485 (No)
Flinch [1-180/600]: 128 (Yes)
Damage: (8+9-8)*1.5 = 13.5~14
6 EN
Tapu Bulu flinched!
Tapu Bulu & Tyranitar: +2 HP (Grassy Terrain)
Tapu Bulu: -2 HP (Sandstorm)
Step Two
Tyranitar used Iron Head!
Crit [1-25/600]: 577 (No)
Flinch [1-180/600]: 263 (No)
Damage: (8+9-8)*1.5 = 13.5~14
10 EN
Tapu Bulu used Disable!
Tyranitar: Disabled (Iron Head, 6s)
7 EN
Tapu Bulu & Tyranitar: +2 HP (Grassy Terrain)
Tapu Bulu: -2 HP (Sandstorm)
Step Three
Tyranitar used Struggle!
Crit [1-25/600]: 70 (No)
Damage: 5+9-8 = 6
Recoil: 6*0.4 = 2.4~2
5 EN
Tapu Bulu used Horn Leech!
Crit [1-25/600]: 267 (No)
Damage: (8+3+9-10+2)*1.5 = 18
Heal: 18*0.5 = 9~5
8 EN
Tapu Bulu & Tyranitar: +2 HP (Grassy Terrain)
Tapu Bulu: -2 HP (Sandstorm)
Field: ~
Tapu Bulu: +1 Speed