I personally think there is one huge and easy improvement that you can make for the team:
Seismitoad>Empoleon
Seismitoad @ Leftovers
Ability: Water Absorb
EVs: 252 HP / 244 Def / 12 Spe
Bold Nature
- Stealth Rock
- Scald
- Earthquake
- Knock Off
It is a bit weaker stat wise. However, it fits...