Where can I find a damage calculator?

Question

I need one

Answer 1

Here (showdown) - the ultimate damage calculator, it can calculate every single generation, including 1!

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Here (Smogon)
Here's one for gen 5 (PokeDS)
Here's one for gen 4 (Serebii)

Comments

+1 cuz you included other gens

Answer 2

Pokemon Showdown's Damage Calculator
Psypoke's Damage Calculator

Since this could easily be looked up on Google, I will give you a page of Pokemon DMG Calculators here.