1) Pachirisu is just HORRIBLE. Really, why not Azelf/Crobat/Kitsunoh/Zapdos/whatever-but-not-Pachirisu?
2)Rain teams should never waste turns. There's no reason to use Dive on Ludicolo. It only help your opponent stall you out of Rain turns
3)You need a more offensive Arghonaut variant to properly work in the rain. The SubPunch variant may work
4)With Fidgit everywhere, those Toxic Spikes are just a waste. It would be better to put Stealth Rock somewhere. It helps a lot more by virtue of Rain Dance teams offensive nature.
5)You have nothing - really nothing - to switch into a ThunderWave. Heck, you have nothing to switch into Electric attacks in general. with no defensive EV, even Ludicolo will struggle against the likes of Jolteon and Zapdos.
6)Last thing, once your Kingdra is gone, good luck fighting SkarmBliss.
P.S.: If it was not clear, REMOVE PACHIRISU. It's just that bad. Sorry.