I would suggest Shadow Ball for your Mr. Mime, as it covers Ghost and other Psychic types. Are you using Defog to clear entry hazards? With Crobat's Flying typing, it won't like switching in to Stealth Rock, so I'd recommend a Rapid Spinning Blastoise for the job, as it's bulky, and it has a movepool with Foresight, Scald and Ice Beam.
Also, while Ninjask can run a Choice Band set, it is usually best played as a Baton Passer, what with its huge Speed and amazing ability, so I'd suggest a more standard set, with X-Scissor, Baton Pass, Substitute and Swords Dance, but a Choice set can work well too, and surprise your opponent, so it's your choice. The rest of your team looks good.
Hope I helped :)