If you want to use furret, equip a silk scarf/choicescarf. It should sweep easily, if your furret is happy dont really fancy furret though, but the coverage moves you gave to him/her looks good (although its low Sp Atk doesnt do those moves justice)
give vaporean surf and icebeam too
You might want to get a ground type and an electric/grass (if furret cant cut it). (for the final battle against red's pikachu/lapras/blastoise). actually typlosion can beat lapras, make sure u set up sunny day before his lapras comes out though.
if u use furret its rain dance will help lapras and i dont think thunder can even 3hko it.