Question

Example: Smeargle already knows Earthquake. Can it get another Earthquake attack using Sketch?

Answer 1

No. . .the move sketch can copy any move that was used last by its opponent permanently. .but it cannot copy the same move twice

Answer 2

I do not think so, because no other pokemon can learn twoof the same move. I highly doubt it.

Comments

Missingno knows Water Gun twice, but that probably doesn't count because it's a glitch.