I remember Genesect being awesome in Gen V OU, so I'm hoping that in this gen's OU too, Phoine, Excadrill, the trio all fell because of the nerf of perma-weather, Deoxys-D and Deoxys-S were on the verge of falling even last gen, this might be really interesting. I'm looking forward for using Genesect and Deoxys-S in OU.
I wonder if Phione even deserves OU though, he lost everything with the weather loss, unlike the trio who can manage with their therian form in OU. So phione, I don't think will be that popular in OU. Genesect was immensely popular so again, scarf Genesect is so good.
Deoxys-S is just too good in every way possible, suicide lead with psycho boost, super power + Psycho Boost set, Hazards + HP Fire. That thing is gonna be dominant, unlike Doexys-D which has very low usage even in OU.
Excadrill, the perfect Rapid Spinner along with Mold breaker and Earthquake defeating every levitate-r like Gengar and the Rotoms
I think Landorous fell enough to be less useful then his Therian form. However Thundurous Prankster is still better than his therian form (IMO)