OFFENSIVE CORE
Reuniclus @ Choice Specs
Ability: Regenerator
Evs: 252 HP/252 SpAtt/4 SpD
Nature: Modest/Quiet
Moves:
-Future Sight
-Psyshock
-Focus Blast
-Shadow Ball
Toxicroak @ Life Orb
Ability: Dry Skin
Evs: 252 Attack/252 Spd/4 SpD
Nature: Adamant
Moves:
-Swords Dance
-Gunk Shot
-Drain Punch
-Sucker Punch
Fun little core I've been messing around with and it honestly works very well. This core fits in well on bulky offense teams simply because of the sheer damage of a specs reuniclus future sight, due to its buff from 100 to 120 base power this gen. With regenerator and decent bulk, reuniclus also works as a good pivot. The general idea is to switch reuniclus on things that can't hurt it much and fire off a future sight. Most things that switch in following this (umbreon, florges, blissey, forretress, empoleon, etc) will not enjoy dealing with toxicroak. From that point your opponent has to choose between letting toxicroak set up in their face, killing them outright, or letting something else take a massive hit from future sight (calcs below).
On the flipside, many things that would normally counter toxicroak are completely mauled by future sight. Crobat, donphan, chesnaught, hippowdon, and swampert are put within KO range from toxicroak after a future sight, if not OHkoed entirely, making it much easier to get a sweep.
As said before, this core works best on bulkier teams that can wall threats and do decent damage. Even seeminglessly harmless walls are incredibly dangerous when a future sight is incoming. Having volt switch/u-turn users to get reuniclus in safely is recommended if building a team around this core. Forretress is a solid partner to this core since it can set up hazards which are greatly appreciated due to the number of switches caused, and can provide a slow volt switch to pivot. Defensive Rotom Heat provides a ground immunity and additional coverage, along with volt switch and the ability to wall a number of threats. Umbreon also comes to mind being able to provide wish and heal bell support and stop even more threats.
Overall, this core is quite unique and very fun to play with, while also being very effective at the same time. Give it a try if you want something new to play around with.
Some cals showing off the power of specs reuniclus:
252+ SpA Choice Specs Reuniclus Future Sight vs. 252 HP / 252+ SpD Hippowdon: 277-327 (65.9 - 77.8%) -- guaranteed 2HKO after Leftovers recovery
252+ SpA Choice Specs Reuniclus Future Sight vs. 248 HP / 0 SpD Forretress: 237-279 (67.1 - 79%) -- guaranteed 2HKO after Leftovers recovery
252+ SpA Choice Specs Reuniclus Future Sight vs. 252 HP / 24+ SpD Florges: 193-228 (53.6 - 63.3%) -- guaranteed 2HKO after Leftovers recovery
252+ SpA Choice Specs Reuniclus Psyshock vs. 252 HP / 252+ Def Blissey: 379-447 (53 - 62.6%) -- guaranteed 2HKO after Leftovers recovery
252+ SpA Choice Specs Reuniclus Future Sight vs. 252 HP / 120 SpD Mega Aggron: 164-193 (47.6 - 56.1%) -- 83.2% chance to 2HKO