The biggest problem is finding someone with a Worlds Scrafty. Only about 1000 people in the world have one. I am trying to find someone who has it, though, but so far that search hasn't gone all too well.
A shiny Larvitar? I might use it on my team, but I already have several Tyranitar waiting in the wings. It's possible, though! It's Adamant and comes with Superpower, which could help.