Step 1:

Nohface used Iron Head! (-6 EN)
Crit (1, d24): 8 (No), Flinch (1 - 3, d10): 5 (No)
(8*1 + 0 + 0 + (6 - 3) + 0)*1 + (0 - 0)*4 + 0 = 11

Beedrill used Aerial Ace! (-4 EN)
Crit (1, d24): 16 (No)
(6*1 + 0 + 0 + (7 - 4) + 0)*1 + (0 - 0)*4 + 0 = 9
Step 2:

Nohface used Iron Head! (-6 EN)
Crit (1, d24): 4 (No), Flinch (1 - 3, d10): 1 (Yes)
(8*1 + 0 + 0 + (6 - 3) + 0)*1 + (0 - 0)*4 + 0 = 11

Beedrill flinched!

Beedrill is flinching!
Step 3:

Nohface used Iron Head! (-6 EN)
Crit (1, d24): 12 (No), Flinch (1 - 3, d10): 9 (No)
(8*1 + 0 + 0 + (6 - 3) + 0)*1 + (0 - 0)*4 + 0 = 11

Beedrill
fainted!
Round Summary

Nohface HP: -9

Nohface EN: -6-6-6 = -18

Beedrill HP: -11-11-11 = -33

Beedrill EN: -4