Ok, let's say you have a Cyndaquil with a special attack boosting ability at level 1 that knows Flamethrower.
Sunny Day is in effect.
You're against a level 30 Parasect with Dry Skin.
Cyndaquil is holding a Choice Scarf.
Cyndaquil uses Flamethrower, and gets a critical hit.
What power is it and how much damage would it do?