Demons: WoW Battle Pets

Drop: Supremus [??+]

Zone: Black Temple

Approximate Drop Rate: 1 in 33

Pet Battle: Baa'l

Pet Battle: [23-25] Frostfire Ridge

Promotion: Diablo IV & WoW crossover event (A Greedy Emissary)

Drop: M'uru [??+]

Zone: Sunwell Plateau

Approximate Drop Rate: 1 in 25

Vendor: Falara Nightsong

Zone: Thaldraszus

Cost: 2750 (unlimited supply)

Drop: Box of Collapsed Reality

Approximate Drop Rate: Unknown

Drop: High Astromancer Solarian [??+]

Zone: Tempest Keep

Approximate Drop Rate: 1 in 11

Promotion: SteelSeries x World of Warcraft 20th Anniversary Celebration

Pet Store 

Pet Battle: [14-15] Felwood

Promotion: World of Warcraft Collectors Edition

Drop: Prince Malchezaar [??+]

Zone: Karazhan

Approximate Drop Rate: 1 in 20

Achievement: Reeking of Visions

Category: Visions of N'Zoth

Pet Battle: [23-24] Twilight Highlands

Pet Battle: [25] Mac'Aree

Drop: Darbel Montrose [50+]

Zone: Arathi Highlands Warfront

Approximate Drop Rate: Unknown

Achievement: Family Battler

Category: Battle