.Action 1:

(Chimchar used Flamethrower!)
RNG Roll (CRIT) [<=625 CRIT]: 3129/10000 (NO)
[10+3+(3-3)]*1.5 = 19.5 damage (Wurmple)
-6 energy

(Wurmple used Poison Sting!)
RNG Roll (EFFECT) [<=3000 EFFECT]: 9463/10000 (NO)
4+3+3+(4.5-3) = 11.5 damage (Chimchar)
-6 energy


.Action 2:

(Chimchar used Flamethrower!)
RNG Roll (CRIT) [<=625 CRIT]: 2662/10000 (NO)
[10+3+(3-3)]*1.5 = 19.5 damage (Wurmple)
Wurmple is KO'ed!
-10 energy


.Post Round:
(Wurmple:) -39 HP, -6 EN, KO'ed
(Chimchar:) -11.5 HP, -16 EN