My core is Dusknoir + Zebstrika + Relicanth
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Frankly, the team doesn't seem to be built with them in mind on any level, and due to volt switch and bulk, they form nice synergy for shuffling around and utterly dismantling the team.
Dusknoir @ Life Orb
Ability: Pressure
EVs: 212 HP / 252 Atk / 44 Spe
Adamant Nature
- Shadow Sneak
- Sucker Punch
- Earthquake
- Ice Punch
Ice punch OHKOs Ninjask, OHKOs Gabite 62.5% of the time w/o sr, and OHKOs Drifblim after sr.
Shadow Sneak does 50%+ to Ninjask, at least 19% to gabite, 60%+ to Drifblim, and is the strongest move to hit grumpig w/colbur at minimum 65%.
Sucker Punch does ~ 75% to Ninjask, at least 25% to gabite, at least 83% to Drifblim, and is the stronngest move to take out grumpig w/o its colbur at at least 86%.
Earthquake OHKOS Raichu, and is the most damaging move against lumineon at 32% minimum damage (almost guaranteed 3hko after sr and leftovers).
All of his attacks 2hko raichu, he wrecks the physical attackers, and hits lumi ok on the switch. The only issue is grumpig, who he can revenge.
Zebstrika @ Life Orb
Ability: Lightning Rod
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Volt Switch
- Thunderbolt
- Overheat
- Hidden Power Ice
Volt switch does minimum 29% to grumpig, putting it in revenge range of dusknoir with guaranteed revenge after sr. It also does minimum 74% to blim, and minimum 70% to lumineon. Ninjask dies to any non hp ice attack, and nearly dies from that. If it can get a lightning rod boost from raichu, overheat ohkos it after sr or a lo hit. Hp ice ohkos gabite.
Relicanth @ Leftovers
Ability: Rock Head
EVs: 248 HP / 252 Def / 8 SpD
Impish Nature
- Stealth Rock
- Head Smash
- Yawn
- Protect
Relicanth has amazing bulk, which allows it to reliably set sr a few times. It has access to yawn to force switches, particularly from lumineon and gabite. Head smash hits everything on the team not named gabite hard as it 2hkos everything but lumineon which is 3hkos, and gabite which it chips; plus gabite fails to 3hko reli with yawn+protect and leftovers recovery, and lumi can't even 5hko reli unless he's burned at some point.
All together, this team stands no chance. Everything is dented by 2 other mons on the core, and is easily defeated with the available moves.