It can't wall any of the three wallbreakers because it doesn't have access to recovery. It CAN, however counter Gardevoir so long as Hoopa is reasonably healthy. It can't counter Medicham, but it can check it if it gets in free/ switches in on a fighting move.Ik but Aegi it looks to fill a nice role really. It can possibly wall two of the three premier Mega wall breakers (garde and Medi) while taking a hit as it needs to from Hera while attacking super effectively on it. I just sorta like that it can do that a little while having some nice overall utility.
EDIT: Course this is just me theorizing. I don't acess to calcs so there is that.
Also, you can do the calcs, you just have to edit the typing and base stats.