Smeargle can be found on route 2 on Melemele island.
Lead off with the Pokémon that has the move you want Smeargle to use. Find a wild Smeargle and have it sketch the move you want. Then switch into your own Smeargle and have it sketch the same move the wild Smeargle used.
Level up then your Smeargle will learn sketch again.
![](https://s2.save4k.ru/pic/T2m8DWOt1aY/maxresdefault.jpg)