.Action 1:

(Chimchar used Fire Blast!)
RNG Roll (CRIT) [<=625 CRIT]: 262/10000 (CRIT)
[12+3+3+(3-3)]*1.5 = 27 damage (Wurmple)
-7 energy

(Wurmple used Poison Sting!)
RNG Roll (EFFECT) [<=3000 EFFECT]: 9974/10000 (NO)
4+3+3+(4.5-3) = 11.5 damage (Chimchar)
-2 energy


.Action 2:

(Chimchar used Flamethrower!)
RNG Roll (CRIT) [<=625 CRIT]: 3407/10000 (NO)
[10+3+(3-3)]*1.5 = 19.5 damage (Wurmple)
-6 energy

(Wurmple used Bug Bite)
RNG Roll (CRIT) [<=625 CRIT]: 9735/10000 (NO)
[6+3+(4.5-3)]/1.5 = 7 damage (Chimchar)
-3 energy


.Action 3:

(Chimchar used Fire Blast!)
RNG Roll (CRIT) [<=625 CRIT]: 3448/10000 (NO)
[12+3+(3-3)]*1.5 = 22.5 damage (Wurmple)
-7 energy

(Wurmple used Poison Sting!)
RNG Roll (EFFECT) [<=3000 EFFECT]: 5971/10000 (NO)
4+3+3+(4.5-3) = 11.5 damage (Chimchar)
-2 energy


.Post Round:
(Wurmple:) -69 HP, -7 EN
(Chimchar:) -30 HP, -20 EN