I think that you should definitely consider putting your Foretress in the lead position, and dropping Explosion and Toxic Spikes for Rapid Spin and Payback. I don't know why you would use a Ratatta outside of FEAR, and even then FEAR has no chance of doing its job with the prevalence of entry hazards and priority moves. And then you have some other members that are also unviable, such as Butterfree and Zubat and Mudkip. Blissey may or may not be a viable member, seeing as half of your team is outclassed in today's metagame and will need to be replaced, leaving Blissey as a teammember up in the air. Also, I don't have any clue why you would lead with Blissey when you could lead with something else.