Samurott: Fine, just replace Megahorn with X-Scissor.
Chandelure: Fine, but don't waste your Evs on Attack.
Druddigon: Give it a Rocky Helmet to hold. I'd go with this moveset.
Aqua Tail and Fire Punch are from Move Tutors, just in case you should know.
Archeops: Fly is good for getting around, and STAB. But read this. It's a citation from one of the comments.
Fly is a horrible move in competitive play. It's just giving your opponent a chance to switch out to something with a Flying resistance.
It's your choice if you want the move. Acrobatics is probably better, though.
The rest is OK.
Galvantula: Thunderbolt is better than Thunder. I don't agree with Double Team. Here's another citation.
Double Team is banned in Competitive play
If you're going to use your team in competitive play, change their moves. Thunder Wave
is OK, but Galvantula already has a great Speed stat.
Whimsicott: Sorry, it's another citation!
No point of Hurricane on Whimsicott; no STAB, mediocre Sp. Atk, 70% accuracy w/o rain, and you're covering your Taunt liability with Energy Ball. Personally, I'd go for: Substitue, Toxic/ Taunt, Giga Drain/ Leech Seed, U-Turn. I'm making this into a U-Turn team...
I think this comment is right.
It's the final citation, OK?
^ This team would be UU.
That's true. So the question should be titled "Time for my new UU Unova ultimate team!