Hey, Stvn :B
Why not Meteor Mash > Flamethrower? It still hits Aggron and Froslass.
Pikachu isn't quickly to use a Nasty Plot and sweep.
Encore is nice. But you can learn Surf + HP Ice.
Oh yeah, with this set, you are walled by Laturn.
So, Meteor Mash > Flamethrower.
Draco Meteor > Dragon Pulse...