going with a tried and true classic core thats been around since day one of XY:
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Rotom-W + Landorus-T + Greninja
Ok so the reason why Im posting this is because 1). It is extremely effective in the Metagame, and 2). This is a core that has been battle-hardened since the days of BW (with ninja being replaced by something else, ofc). Anyways, the whole point of this core is for Lando and Rotom to provide VoltTurn support to get Greninja into the battle safely, seeing as he has the defenses of a wet paper bag. Once inside though, hes a threat. As we all know, Greninja got a gem in ORAS in the form of Gunk Shot, which turned his former Fairy-type checks into liabilities. Aside from that, Greninja also has STAB everything to wreck havoc on opposing teams. The roles of Lando and Rotom boil down to switching into things that Greninja cant kill, and getting Greninja in safely. Its really self explanatory and this core just plays itself once you get a feel for it.
Additionally, good ways to use this are on offensively oriented balance teams and bulky offense teams, as the VoltTurn core provided by Rotom and Lando help to preserve momentum throughout the match. Also, Greninja can really be replaced with any hard hitter, like Mega Gardevoir or Mega Gallade, but I chose Greninja specifically because it doesnt tie you down to a specific Mega and is still a very potent threat in today's metagame.
Rotom-Wash @ Leftovers
Ability: Levitate
EVs: 248 HP / 252 Def / 8 SpD
Bold Nature
IVs: 0 Atk
- Volt Switch
- Will-O-Wisp
- Hydro Pump
- Pain Split
Landorus-Therian (M) @ Choice Scarf
Ability: Intimidate
EVs: 252 Atk / 32 Def / 224 Spe
Jolly Nature
- U-turn
- Earthquake
- Stone Edge
- Knock Off
OR
Landorus-Therian (M) @ Lefotvers
Ability: Intimidate
EVs: 248 HP / 216 Def / 40 Spe
Impish Nature
- U-turn
- Earthquake
- Stone Edge
- Stealth Rock
Greninja @ Life Orb
Ability: Protean
EVs: 4 Atk / 252 SpA / 252 Spe
Naive Nature
- Gunk Shot
- Dark Pulse
- Ice Beam
- Spikes
I swear half my teams are basically ^ that . Really effective core.