Armarouge-Mega
Type: Fire/Psychic
Ability: Analytic
HP: 85
Attack: 60 + 30 = 90
Defense: 100 + 20 = 120
Sp. Attack: 125 + 30 = 155
Sp. Defense: 80 + 30 = 110
Speed: 75 - 10 = 65
New moves: Morning Sun
Description: Unleash. The. Ammo.
This one takes a slower and bulkier approach, Fire/Psychic being far from the best typing defensively but still being able to tank a hit. And oh boy.
+1 252+ SpA Analytic Armarouge Armor Cannon vs. 4 HP / 252+ SpD Blissey: 279-328 (42.7 - 50.3%) -- 1.2% chance to 2HKO
+1 252+ SpA Armarouge Armor Cannon vs. 252 HP / 96 SpD Assault Vest Slowking-Galar: 207-244 (52.5 - 61.9%) -- guaranteed 2HKO
Its obvious weakness is how bad the typing is, as well as Psychic/Fire/Grass still being able to miss some mons coverage wise like Hydreigon, opposing Armarouge, as well as Roaring Moon, as well as wanting to fit Calm Mind for setup, Morning Sun for longevity, Armor Cannon, Psyshock, Energy Ball and Scorching Sands.
Tinkaton-Mega
Type: Fairy/Steel
Ability: Heatproof
HP: 85
Attack: 75 + 20 = 95
Defense: 77 + 30 = 107
Sp. Attack: 70 + 10 = 80
Sp. Defense: 105 + 30 = 135
Speed: 94 + 10 = 104
New moves: None
Description:
Spent so much time in the forge it became pretty resilient to heat. Moreover, it lives in hot regions, hence Heatproof as an ability. Tinkaton is a mon I really like, one of my favs from Gen 9. Fairy/Steel is a crazy good typing, and with added neutrality to Fire it can potentially stomach hits from stuff like Heatran lacking Earth Power, Volcarona, Gouging Fire, as well as the potentially great Armarouge-Mega no matter which sub wins.
Donphan-Mega
Type: Ground
Ability: Gravitas
HP: 90
Atk: 120 + 20 = 140
Def: 120 + 20 = 140
SpA: 60 + 10 = 70
SpD: 60 + 50 = 110
Spe: 50
New moves: None
Description: Gholdengo public execution.
OK so, trying to find a niche to Great Tusk/Iron Treads prototype is hard, as they have tools it doesn't have, like Headlong Rush and Close Combat for Tusk, or Volt Switch for Treads. I wanted to focus on having Hazard removal that can just send Gholdengo to the Shadow Realm, so this ability came to mind. It also can hit Skarmory (for when it'll come back) and Corviknight, and just slay them. So basically, either a Hazard setter that can win against some nice removal like Corviknight, or Hazard removal that can win vs the likes of Gholdengo etc.