Well, the first thing that jumps out at me is the lack of Rapid Spin or Defog (though with taunt on Mienfoo and only one rock weakness it's probably not a huge priority.) It's also really weak to Chinchou (as noted above). Therefore, you obviously need a Seedot to comple- I'M SORRY PLEASE DON'T LYNCH ME.
Lileep @ Eviolite
Ability: Storm Drain
Level: 5
EVs: 188 HP / 140 Def / 28 SpA / 140 SpD / 12 Spe
Calm Nature
- Stealth Rock
- Giga Drain
- Recover
- Ancient Power
This mon provides similar assistance to Ferroseed, but it also has good synergy with Hippotas, since water moves are generally what people seem to use if they don't have a Snivy. Again, I don't think this team really needs to be able to get rid of hazards that urgently.
But seriously tho, Seedot completes the team perfectly.