Nah, I am not the King of Ubers, there should be better candidates out there such as Jibaku...Gastrodon did fine with its auspicious typing and access to Recover.Ahh another great team from the king of Ubers (sorry Jibaku :P). Like a lot of others, my first reaction to Gastrodon... O.o really? But you've proven just how well it can work. There are a few minor weaknesses though:
Tyranitar can't damage Lugia much unless it manages to land some Defense drops. The dinosaur itself hates Toxic. While Tyranitar harasses my team, Kyogre annoys sand teams a lot, since many of them are weak to it.
I am not changing Dialga to Jirachi though but thanks for the suggestion. Reason: Dialga is no only the King but he is my check to Ferrothorn, Forretress, and at least phazes out Grass Arceus. I like the Roaring prowess of Dialga and he can also check Ho-Oh in the rain and defeat Substitute Zekrom, Jirachi just makes Forretress more of an asshole and since this a rain team, Fire Punch will do laughable damage. Fire Blast is just so important in my team, and Dialga can actually defeat Groudon with 2 Fire Blasts.
Gastrodon has Clear Smog to stop Manaphy from setting up for free. That slug can also defeat Darkrai in a pinch while Ferrothorn can Gyro Ball Darkrai for huge damage but hates Focus Blast. Giratina-O can pick of Darkrai at 1 HP.
Thanks for rating.