Manaphy's best set will come when others setup Rain for it; it really needs three attacks to be 'uber' threatening. It could work well for stalling as well. If you think SubSeeding Skymin is annoying, just wait for HydroResting Manaphy placed on a good team.
Still, I'd like to see it in OU. It will increase the number of Rain Dance teams, and PROBABLY increase the number of Hail based teams, thanks to Abomasnow being one of the best Manaphy counters around.
Still, I'd like to see it in OU. It will increase the number of Rain Dance teams, and PROBABLY increase the number of Hail based teams, thanks to Abomasnow being one of the best Manaphy counters around.