Step 1:

Heracross used Rock Slide!
Miss (10, d10): 3 (No miss), Crit (1, d24): 12, Effect (1 - 3, d10): 1 (Yes flinch)
(8*1 + 0 + 0 + 6 + 0)*1.5 + (0 - 0)*2 + 0 = 21
-6 EN

Beedrill flinched!

Heracross was buffeted by the

Sandstorm for -2 HP!

Beedrill was buffeted by the

Sandstorm for -2 HP!
Step 2:

Heracross used Rock Slide!
Miss (10, d10): 6 (No miss), Crit (1, d24): 23
(8*1 + 0 + 0 + 6 + 0)*1.5 + (0 - 0)*2 + 0 = 21
-6 EN

Beedrill used Aerial Ace!
Crit (1, d24): 5 (No crit)
(6*1 + 0 + 0 + 5 + 0)*2 + (0 - 0)*2 + 0 = 22
-4 EN

Heracross was buffeted by the

Sandstorm for -2 HP!

Beedrill was buffeted by the

Sandstorm for -2 HP!
Step 3:

Heracross used Rock Slide!
Miss (10, d10): 8 (No miss), Crit (1, d24): 14 (No crit)
(8*1 + 0 + 0 + 6 + 0)*1.5 + (0 - 0)*2 + 0 = 21
-6 EN

Beedrill used Aerial Ace!
Crit (1, d24): 11 (No crit)
(6*1 + 0 + 0 + 5 + 0)*2 + (0 - 0)*2 + 0 = 22
-4 EN

Heracross was buffeted by the

Sandstorm for -2 HP!

Beedrill was buffeted by the

Sandstorm for -2 HP!

The Sandstorm rages! (4 => 3 rounds remaining)
Round Summary

Heracross HP: -2-22-2-22-2 = -50

Heracross EN: -6-6-6 = -18

Beedrill HP: -21-2-21-2-21-2 = -69

Beedrill EN: -4-4 = -8