Battle Pets by Zone

Pet Battle: [20-22] Borean Tundra; [22-23] Dragonblight; [22-23] Zul'Drak; [22-23] The Storm Peaks

Pet Battle: [6-7] Hillsbrad Foothills; [10-11] Western Plaguelands; [14-15] Swamp of Sorrows; [22-23] Zul'Drak; [23-24] Twilight Highlands

Pet Battle: [1] Gilneas; [1-2] Eversong Woods; [1-2] Dun Morogh; [3-4] Westfall; [3-6] Loch Modan; [3-6] Ghostlands; [3-6] Silverpine Forest; [7-9] Northern Stranglethorn; [11-12] Feralas; [12-13] Dustwallow Marsh; [18-19] Zangarmarsh; [18-19] Terokkar Forest; [18-19] Nagrand (Outland); [20-22] Howling Fjord; [21-22] Sholazar Basin; [22-23] Zul'Drak; [23-24] Tol Barad; [25] Nagrand (Draenor)

Pet Battle: [1] Orgrimmar; [1] Gilneas; [1-2] Elwynn Forest; [1-2] Dun Morogh; [1-2] Tirisfal Glades; [1-2] Teldrassil; [1-2] Gilneas City; [3-6] Ghostlands; [3-6] Azshara; [5-7] Stonetalon Mountains; [6-7] Hillsbrad Foothills; [11-12] The Hinterlands; [12-13] Dustwallow Marsh; [12-13] Eastern Plaguelands; [14-15] Swamp of Sorrows; [16-17] Blasted Lands; [17-18] Winterspring; [20-22] Howling Fjord; [22-23] Zul'Drak; [22-23] The Storm Peaks; [23-25] Shadowmoon Valley (Draenor)

Pet Battle: [20-22] Borean Tundra; [20-22] Howling Fjord; [21-22] Sholazar Basin; [21-22] Grizzly Hills; [22-23] Zul'Drak; [22-23] The Storm Peaks; [22-23] Icecrown; [22-23] Dragonblight; [22-23] Crystalsong Forest

Pet Battle: [22-23] Zul'Drak