Is there a thing like or is there an Opposite type attack weakening

Question

I know there is STAB but if you use a move of a type that your guy is weak to or not very effective to, does it weaken your attack power?

Answer 1

No, it does not. Remember, dragon type moves are super effective on dragon type pokemon, but dragon type pokemon are just fine using dragon moves;)

Answer 2

No there is not.

Answer 3

It is possible, but it might also never be able to learn it, like a water type pokemon learning a eletric type move

(Not included with Lanturn or its minor evalution

Comments

Many water pokemon can learn thunder moves like starmie almost always have thunder.