Sheesh, you should start to rely on me for your UU teams :P I'm getting good at rating and coming up with my own sets. Let's go!
I would suggest replacing Leftovers for Life Orb. This will boost his attack moves, plus won't do damage to you with Swords Dance. Also, replace Substitute for Night Slash.
A great Fire-type Special sweeper. Good set.
Good, but you may want to make him a mixed tank. He's great with the role, as his stats are all about even, except for his over 100 defenses. Here's a good set to take advantage:
Blastoise (M) @ Sitrus Berry
EVs: 124 Atk, 252 Def, 60 SpAtk, 72 SpDef
This is a Blastoise more on the offensive side, but you can make it to a perfect tank.
Sad Shaymin Sky is higher ranked, as it would've been perfect. You might want to replace Air Slash for Sunny Day for max healing with Synthesis. You have a Special Sweep-healer.
Is this a staller? If so, you have it all wrong. Crobat's not gonna survive a many attacks, so take out Taunt and put in Cross Poison. High critical-hit ratio and a chance to poison. Or Toxic, if you want.
No no no no no, this set is of NO USE to you. We'll make him a full-on annoyer.
Snorlax (F) @ Leftovers
Trait: Thick Fat
EVs: 252 HP, 248 Def, 8 SpDef
There you go. Annoying Snorlax for the win! Woohoo!
I enjoyed rating your team Mew :3. Hope I can do it again :)