Step 1
Swampert used Knock Off! (-3 EN)
Crit (1, d24): 17 (No)
(10 + (14 - 9))*1 = 15
Ferrothorn dropped the Leftovers!
Swampert was hurt by Ferrothorn's Iron Barbs! (-3 HP)
Ferrothorn used Seed Bomb + Swords Dance! (-4 EN, -1 Tech)
Ferrothorn's Attack sharply rose! (+2 Atk, next 5 turns)
Crit (Yes)
(8 + 3 + 3 + (7 - 7))*2 + (2 - 0)*4 = 36
(Ferrothorn's Crit stage returned to normal)
Step 2
Swampert used Superpower! (-3 EN)
Crit (1, d24): 13 (No)
(12 + (14 - 9) - 2)*1.5 => 23
Swampert's Attack fell! (-1 Atk, next 2 turns)
Swampert's Defense fell! (-1 Def, next 2 turns)
Swampert was hurt by Ferrothorn's Iron Barbs! (-5 HP)
Ferrothorn used Seed Bomb! (-3 EN)
Crit (1, d24): 13 (No)
(8 + 3 + (7 - 7))*2 + (2 - (-1))*4 = 34
Swampert fainted!
Round Summary

HP: -3-36-5-34 = -78

EN: -3-3 = -6

HP: -15-23 = -38

EN: -4-3 = -7