Please suggest a 6th pokemon for my team?

You should really teach Politoad Rest and have it holding a berry that cures Sleep because Belly Drum will suck up half your life. Your sixth should either be good in defenses or sp. attack. Since you already have a lot in attack you don't need another one. You should get Umbreon maybe or Cresselia, or just something that has high defenses and ev-train it. Either that or get a good sp. attacker like Mewtwo, Espeon etc. If you ev-trained Typhlosion in sp. attack why does it even know Earthquake and Quick Attack, those are physical. Also Eruption will cause much damage only if Typhlosion's health is high, that's why i dont like it because if the health is low it might have like 30 power instead of 150. Delete Quick Attack from Scizor for another physical move, really Quick Attack is so weak. If you're planning to use Giga Impact you should always use it as a finishing move as you need time to recharge at the next round.