Cobalion as a Check
Cobalion @ Leftovers
Ability: Justified
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Iron Head
- Swords Dance
- Close Combat
- Substitute
Tyrantrum's best move against Cobalion is EQ which 2HKOs after Leftovers recovery but aside from that Tyrantrum can barely 3HKO Cobalion with Outrage. Head Smash and Crunch do laughable damage and can be set up on with this set. SubSD Cobalion takes full advantage of Tyrantrum locking itself into a Head Smash or especially Crunch, nabbing an Attack boost on it, as it can Sub on it or SD and proceed to do damage to the opponent's team. Head Smash also doesn't break the Sub without a very high roll so Cobalion doesn't have to worry about getting its HP worn down while trying to Sub on a Head Smash.

Cobalion @ Leftovers
Ability: Justified
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Iron Head
- Swords Dance
- Close Combat
- Substitute
Tyrantrum's best move against Cobalion is EQ which 2HKOs after Leftovers recovery but aside from that Tyrantrum can barely 3HKO Cobalion with Outrage. Head Smash and Crunch do laughable damage and can be set up on with this set. SubSD Cobalion takes full advantage of Tyrantrum locking itself into a Head Smash or especially Crunch, nabbing an Attack boost on it, as it can Sub on it or SD and proceed to do damage to the opponent's team. Head Smash also doesn't break the Sub without a very high roll so Cobalion doesn't have to worry about getting its HP worn down while trying to Sub on a Head Smash.
252 Atk Choice Band Tyrantrum Head Smash vs. 0 HP / 0 Def Cobalion: 70-82 (21.6 - 25.3%) -- possible 5HKO after Leftovers recovery
252 Atk Choice Band Tyrantrum Earthquake vs. 0 HP / 0 Def Cobalion: 250-296 (77.3 - 91.6%) -- guaranteed 2HKO after Leftovers recovery
252 Atk Choice Band Tyrantrum Outrage vs. 0 HP / 0 Def Cobalion: 112-132 (34.6 - 40.8%) -- 62.2% chance to 3HKO after Leftovers recovery
252 Atk Choice Band Tyrantrum Crunch vs. 0 HP / 0 Def Cobalion: 50-59 (15.4 - 18.2%) -- possible 8HKO after Leftovers recovery
252 Atk Cobalion Close Combat vs. 4 HP / 0 Def Tyrantrum: 264-312 (86.2 - 101.9%) -- 12.5% chance to OHKO
252 Atk Cobalion Iron Head vs. 4 HP / 0 Def Tyrantrum: 176-210 (57.5 - 68.6%) -- guaranteed 2HKO
252 Atk Choice Band Tyrantrum Earthquake vs. 0 HP / 0 Def Cobalion: 250-296 (77.3 - 91.6%) -- guaranteed 2HKO after Leftovers recovery
252 Atk Choice Band Tyrantrum Outrage vs. 0 HP / 0 Def Cobalion: 112-132 (34.6 - 40.8%) -- 62.2% chance to 3HKO after Leftovers recovery
252 Atk Choice Band Tyrantrum Crunch vs. 0 HP / 0 Def Cobalion: 50-59 (15.4 - 18.2%) -- possible 8HKO after Leftovers recovery
252 Atk Cobalion Close Combat vs. 4 HP / 0 Def Tyrantrum: 264-312 (86.2 - 101.9%) -- 12.5% chance to OHKO
252 Atk Cobalion Iron Head vs. 4 HP / 0 Def Tyrantrum: 176-210 (57.5 - 68.6%) -- guaranteed 2HKO