I might as well put a core.
Offensive Core
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Politoed @ Damp Rock
Ability: Drizzle
EVs: 252 Def / 252 HP / 4 SAtk
Bold Nature
- Scald
- Toxic
- Rest
- Sleep Talk
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Kabutops @ Life Orb
Ability: Swift Swim
EVs: 252 Spd / 252 Atk / 4 HP
Adamant Nature
- Waterfall
- Stone Edge
- Low Kick
- Swords Dance
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Kingdra @ Life Orb
Ability: Swift Swim
EVs: 228 Spd / 252 SAtk / 4 SDef / 24 HP
Modest Nature
- Hydro Pump
- Draco Meteor
- Clear Smog
- Scald
This core is amazing. This core is life, this core is happiness, this core is the kind of core that sweeps teams. It's a rain core! Politoed of course sets up the rain, and is an absolute tank. Of course the only main purpose of Politoed is to set up rain. But, you can set up toxic and stall out for a long time with RestTalk. Kabutops and Kingdra are of course the stars of this core, with Swift Swim and awesome offensive stats. Kabutops has a good speed stat, and with a Swords Dance + Double Speed sweeps most of the tier. Waterfall is a nice STAB, and in the rain can dent most pokemon that don't resist it. Stone Edge is Kabutop's most powerful STAB. Low Kick covers most Steel Types and Dark Types. Kingdra is just as effective, yet on the special side. 228 Speed EVs outspeed Scarf Latios, which is truly a threat. Although this moveset seems crazy, bear with me. Hydro Pump is your primary STAB, is boosted by rain, and does a ton of damage to most pokemon who don't resist it. Draco Meteor is apeshit when it comes to damage, but it may need to be a last-resort move due to the special attack drop. Clear Smog is supposed to be what's being seen a lot now: Baton Pass teams. Clear Smog also hurts Calm Minders, and Swords Dance users with the exception of Aegislash. Scald is there for the burn, although it's also nice for not missing.
+2 252+ Atk Life Orb Kabutops Low Kick (120 BP) vs. 252 HP / 0 Def Filter Mega Aggron: 244-289 (70.9 - 84%) -- guaranteed 2HKO
+2 252+ Atk Life Orb Kabutops Stone Edge vs. 252 HP / 252 Def Shuckle: 361-429 (147.9 - 175.8%) -- guaranteed OHKO
+2 252+ Atk Life Orb Kabutops Stone Edge vs. 252 HP / 232+ Def Skarmory: 246-290 (73.6 - 86.8%) -- guaranteed 2HKO after Leftovers recovery
+2 252+ Atk Life Orb Kabutops Waterfall vs. 252 HP / 252+ Def Gastrodon: 313-370 (73.4 - 86.8%) -- guaranteed 2HKO after Leftovers recovery
+2 252+ Atk Life Orb Kabutops Waterfall vs. 252 HP / 252+ Def Florges in Rain: 472-555 (131.1 - 154.1%) -- guaranteed OHKO
252+ SpA Kingdra Hydro Pump vs. 252 HP / 0 SpD Gastrodon in Rain: 282-333 (66.1 - 78.1%) -- guaranteed 2HKO after Leftovers recovery
252+ SpA Kingdra Hydro Pump vs. 252 HP / 0 SpD Skarmory in Rain: 321-378 (96.1 - 113.1%) -- 75% chance to OHKO
252+ SpA Kingdra Ice Beam vs. 252 HP / 252 SpD Latias: 114-136 (31.3 - 37.3%) -- 0% chance to 3HKO after Leftovers recovery
252+ SpA Kingdra Hydro Pump vs. 252 HP / 252+ SpD Clefable in Rain: 184-217 (46.7 - 55%) -- 14.1% chance to 2HKO after Leftovers recovery
252+ SpA Kingdra Hydro Pump vs. 252 HP / 0 SpD Slowbro in Rain: 144-169 (36.5 - 42.8%) -- 97.9% chance to 3HKO after Leftovers recovery
This core is extremely grass weak. The only counter we have to grass types is Kingdra. Kingdra resists it only neutrally as well, but does have Ice Beam to counter. Florges can traumatize Politoed and Kingdra, but Kabutops can OHKO with Waterfall. This core can cover most types well, though.
Pretty much that same core was already posted in the OP.