Blade speaks the Truth: Smeargle's Sketch is a decent move and takes some unorthodox thinking to work around the various limitations, but you can't make an Ultimate Nullifier in any match. Or an Ice Shield with a self-destruct that you claim it has after the round it was snatched when it's made of ice. Or even a colossi of fire to beat your enemy into submission... I'd try it, but I already know it'd get Ref-Hammered through to Jupiter.

Also, Mew currently isn't allowed in ASB because of it's massive move-list *grumblesf-ckinWiggalytuffandnowSmearglewithasmanyormoremoves thanMew*[/rant]