Ah, that's true--in fact, I'm sure there could be a few ninjas that have them as their partners in other regions. [Like Koga and his daughter Janine, for example.] It's a bit of a shame that Ariados have a rare taste and are almost impossible to find in Unova, though. They're more commonly found in places like the Johto region, where as in Unova you'd be more likely to find a Galvantula instead.