Well well. I feel insane answering this. I know you're making a new one and i'll try to answer that one as well.
First of all, make Miltank your lead. He has the bulk to set up Rocks and not getting KO'd. Run Sap Sipper instead of Thick Fat for absorbing Grass attacks directed towards Gorebyss. Everything else is perfect on him.
Long time ago, in the ancient ruins of Alpha, there was hieroglyphs on a wall. They were written by a sage and they said: '' HP Electric over Grass due to a lack of Quagsire in the tier. It get x4 on Mantine, more important I think than x4 on Seismitoad.'' So take HP Grass off and put HP Electric. All else is perfect.
I, by far, prefer Substitute on Haunter than Trick. If not Substitute, give it at least Disable. T-Bolt is not the best option on him. I suggest HP Ground for more coverage. Everything else is good.
Physical Emolga, huh? Well, i suggest an Emolga moveset that may not deceive you.
Emolga @ Leftovers
EVs: 192 Spd/ 160 HP/ 156 SAtk
Modest Nature (+SAtk,-Atk)
- Charge Beam
- Air Slash
Substitute + Charge Beam combo. I guess you know what it is. Air Slash is STAB and has this awesome chance to flinch and Roost is a reliable way to heal yourself.
Sure, you can keep your Emolga.
That Emboar is close to perfect as i suggest Earthquake over Head Smash for less recoil. Nothing else to change.
Simisage? No thanks. You already have too many Special Attackers in your team. I suggest a Support Pokemon. Audino should do the job.
Audino @ Leftovers
EVs: 252 HP/ 252 SDef/ 4 Def
Calm Nature (+SDef,-Atk)
- Heal Bell
The basic Audino Cleric. I would have happily suggested Alomomola but you already have a Water type. Wish is for healing teammates and Heal Bell is for the Status Problems. Toxic is for Stalling and works well with Protect.
I hope i helped you a bit! I know the advice is minor but still.