Blacephalon @ Choice Specs
Ability: Beast Boost
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Shadow Ball
- Fire Blast
- Overheat
- Trick
Because of how damn frail Blacephalon is it's fairly risky to switch it into this core. Lando's EQ is a clean OHKO and Magearna's Fleur Cannon has a chance of 2hkoing (guarantee 2hko after rocks) so Blacephalon can only switch into Fleur Cannon once safely.Although, because of its typing Blacephalon doesn't care too much about any of the other moves Magearna and Lando have.
Once Blacephalon is in it poses a huge threat to this core because of its very high special attack stat being boosted by specs and Blacephalon's access to high BP fire moves:
252 SpA Choice Specs Blacephalon Fire Blast vs. 248 HP / 252+ SpD Assault Vest Magearna: 264-312 (72.7 - 85.9%) -- guaranteed 2HKO
252 SpA Choice Specs Blacephalon Overheat vs. 248 HP / 252+ SpD Assault Vest Magearna: 312-368 (85.9 - 101.3%) -- 6.3% chance to OHKO
Magearna takes severe damage from Blace's fire STAB and provided rocks aren't up it cannot 2hko Blace in return (with very high rolls it can 2hko Blace with Fleur Cannon after rocks and the special attack drop)
Meanwhile Lando-T is even worse off because of its inferior special bulk compared to Magearna:
252 SpA Choice Specs Blacephalon Fire Blast vs. 252 HP / 24 SpD Landorus-Therian: 351-414 (91.8 - 108.3%) -- guaranteed OHKO after Stealth Rock and Leftovers recovery
252 SpA Choice Specs Blacephalon Overheat vs. 252 HP / 24 SpD Landorus-Therian: 415-489 (108.6 - 128%) -- guaranteed OHKO
Additionally, if Blacephalon ko's one member of the core with Fire Blast and obtains the Beast Boost it is guaranteed to OHKO the other member, provided the move doesn't miss.