Yeah I think the general consensus is that Z version is gonna give him a new form, like Giratina and Kyurem. Which is why I've finally decided to invest actual effort in super training mine, as a long-term investment.
Also he does have a signature move -- Land's Wrath. It's move relearner only.
"[Gravity Rush] is like losing your virginity; sometimes you won't know what you're doing, it's over way too quick and it's totally amazing!" -CBrate