I was just getting myself another skullrex and a gargoyle summoned ’ hadepup’ how do I get one? are they a previous OM or unattainable atm?

Future mission monster.

Sometimes OM’s are summoned. All kinds of random stuff get summoned however, you are not able to catch anything that is summoned. 

Can’t wait for hadepup and his evolution… Looks so awesome.

Lol i forgot