Step 1
Toxicroak used Dual Chop! (-4 EN)
Miss (10, d10): 4 (No), Crit (1, 2d24): 4, 17 (No)
((4 + (8 - 11))*1 + (4)*1)*0.75 => 4
Dusclops's poison worsened! (4 Dosage)
Dusclops used Psychic!
Crit (1, d24): 18 (No), Drop (1, d10): 4 (No)
(9 + (5 - 3) - 2)*2 = 18

Dusclops was hurt by the poison! (-4 EP)
Step 2
Toxicroak used Dual Chop! (-4 EN)
Miss (10, d10): 6 (No), Crit (1, 2d24): 10, 5 (No)
((4 + (8 - 11))*1 + (4)*1)*0.75 = 4
Dusclops's poison worsened! (5 Dosage)
Dusclops used Psychic!
Crit (1, d24): 8 (No), Drop (1, d10): 8 (No)
(9 + (5 - 3) - 2)*2 = 18

Dusclops was hurt by the poison! (-5 EP)
Round Summary

HP: -18-18 = -36

EN: -4-4 = -8

EP: -4-4-4-5 = -17