Step 1
Ursaluna used Thief! -4EN
Crit: (10, d240): 130 (No)
(6+(5-11)) = 0 DMG
Ursaluna stole Toxapex's Leftovers!
Toxapex used Covet! -4EN
Crit (10, d240): 21 (No)
(6+(6-9)) = 3 DMG
Toxapex stole Ursaluna's Leftovers!

Toxapex munched on it's leftovers
Step 2
Ursaluna used Earth Power! -7EN
Crit (10, d240): 236 (No)
Effect (24, d240): 28 (No)
(9+3+(8-10))*1.5 = 15 DMG
Toxapex used Gunk Shot! -8EN
Hit (216, d240): 197 (Yes)
Crit (10, d240): 19 (No)
Effect (72, d240): 149 (No)
(12+3+(6-9))*.75 = 9 DMG

Toxapex munched on it's leftovers +2HP
Step 3
Ursaluna used Earth Power! -7EN
Crit (10, d240): 166 (No)
Effect (24, d240): 85 (No)
(9+3+(8-10))*1.5 = 15 DMG
Toxapex used Gunk Shot! -8EN
Hit (216, d240): 75 (Yes)
Crit (10, d240): 123 (No)
Effect (72, d240): 218 (No)
(12+3+(6-9))*.75 = 9 DMG

Toxapex munched on it's leftovers +2HP
Round Summary

HP: -3-9-9 = -21

EN: -4-7-7 = -18

HP: -15+2-15+2 = -26

EN: -4-8-8 = -20