Manaphy, Prince / Prince of the Sea of 5th Generation Ubers
A note from the Admins: No Ban Speculation Please
Hit Points: 100
Ph. Attack: 100
Ph. Defense: 100
Sp. Attack: 100
Sp. Defense: 100
Here is the site credentials to Manaphy's movepool from Smogon.
Last generation, he had a short try in OU for his legality in OU's Black and White Era. But the eternal rain just made manaphy too broken since not even Ferrothorn, the Anti Water Rain knight, couldn't beat the Prince of the sea most of the time thanks to the intense power of it's tail glow and water type attacks alone (Scald was the worst just after +3 Ice beam). Rotom Wash and Gastrodon just get swatted by Energy Ball to the mecha face. Jellicent couldn't outstall him thanks to Hydration removing every status under the rain. Thus, the poor prince last generation couldn't hangout with his buddies: Celebi and Jirachi. Mama Kyogre with skymin weren't enough company. Some of the Ubers even said that last generation, Manaphy is one of the poorest performers since its stats are just "not fitting enough for Ubers" unlike Skymin.
When Kalos came to the pokemon world last year of October, the weather creep just got greatly reduced to merely 5 to 8 turns making his pseudo immunity to status gone. Importantly, the rain won't boost its +3/+6 water type attacks as well. While the two factors hurt the fact that it will not be ubers anymore, that trade off gives him a greater reward by making him for the first time "Not Broken" in OU.
With the Uprising of the Bulky Offense (known as the Bulky Offense Renaissance) as of today, Manaphy, like his buddies Celebi, Jirachi, Mew, and Shaymin Land Forme, fits the Bulky Attacking role of today's Metagame. Just like his other friends, he can play multiple roles as well ; from spreading burns through scald, attacking all out with tail glow and its offensive arsenal, up until the tankish cleric role.
With that said, currently on Smogon, Manaphy is actually ranked as A+. The same viability ranking that Talonflame has alongside the Lati twins.
It's standard Uber sets proves to be deadly yet manaeable this time. From Offensive attacker, to Calm Mind attacker. No one wants to mess around this cute thing this time. Probably this time, he is taking Jirachi's spotlight as a bulky attacker no thanks to the steel nerf (and not replacing its Psychic typing with Fairy ... sadly).