Can Smeargle learn the signature moves of legendaries/mythicals?

I recently recieved a shiny Smeargle from Wonder Trade, and I thought that maybe, if a wild Ditto transformed into my Meloetta, I switched out to the shiny Smeargle, then if the wild Ditto used Relic Song and Smeargle used Sketch, then maybe Smeargle can learn Relic Song. I tried to test it, but Ditto killed Smeargle before it could use Sketch. So, before I try anything else, can Smeargle learn signature moves with its Sketch attack?

Pleaselog inorregisterto add a comment.

Smeargle can learn any move except Chatter, but keeping the move of a Mythical/Legendary Pokémon forever is the hard part.

Here’s three steps for getting a Mythical/Legendary Pokémon’s signature move:

Have a Smeargle and Mythical/Legendary Pokémon with it’s signature move in your party. Also, Make sure your Smeargle is slower (has lower speed) than the Mythical/Legendary, otherwise, Sketch won’t work.

Find a double battle you never did before.

Start the double battle. Make your Mythical/Legendary use it’s signature move, then make Smeargle use Sketch (or the other way around, as long as Smeargle is slower than the Pokémon you want to use Sketch on).