Data Farming Locations

Dragon
levels 1-11 : Koromon at Yokahama Village
levels 11-25 : Greymons at Western Area East (mercenary: agumon classic)
levels 25-36 : MetalGreymons at Ruined Historic (mercenary: agumon classic)
levels 36-50 : HellMetalGreymon at Western Area West (mercenary: agumon classic)
levels 50-60 : DarkVeemon at Dark Tower Wasteland (mercenary: Exveemon and Veedramon)
levels 60-75 : Monodramon at B2-Terminal (mercenary: Monodramon)
levels 60-80 : HisyaRyuumon at Maze entrance (mercenary: Ryudamon)
IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi IiIiIi 
Beast
levels 1-11 Tsunomon at Yokahama Village
levels 11-18 Leomon at Western Area Outskirts (mercenary: elecmon)
levels 18-27 Renamon at Wilderness Area (mercenary: renamon)
levels 25-36 WhiteLeomon at Ruined Historic (mercenary: elecmon)
levels 36-47 Mammothmon at Snowman Village (mercenary: sharamon)
levels 50-75 Wendigomon at B2-Terminal (mercenary: Lopmon)
levels 60-75 Cerburamon at Maze Entrance (mercenary: Dobermon & Doggymon)
levels 75-83 Bearmon at Maze F1 (mercenary: Bearmon)
levels 80-86 Grizzmon at Maze F2 (mercenary: Bearmon)
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Devil
levels 1-11 Keramon at Yokahama Village (mercenary: keramon)
levels 11-15 Impmon at Western Village (mercenary: Impmon)
levels 16-27 Devimon at Wilderness Area (mercenary: Impmon)
levels 23-31 IceDevimon at Wind Valley (mercenary: Myotismon and Murksmon)
levels 31-43 NeoDvimon at Oil Refinery-3
levels 43-57 DarkBakemon at Dark Tower Wasteland (mercenary: Bakemon)
levels 60-75 Sinduramon at B2-Terminal (mercenary: Kiwimon)
levels 60-75 Phantamon at B2-Terminal (mercenary: Soulmon)
levels 60-75 Keramon at B2-Terminal (mercenary: Keramon)
levels 60-75 Haguramon at B2-Terminal (mercenary: MechaNorimon & Norimon)
levels 75-83 Goblimon at Maze F1 (mercenary: Goblimon)
levels 75-83 Bakemon at Maze F1 (mercenary: DemiDevimon Bakemon line)
levels 80-86 Ogermon at Maze F2 (mercenary: Goblimon)
levels 80-86 Soulmon at Maze F2 (mercenary: DemiDevimon Soulmon line)
levels 82-90 Phantomon at Maze F3 (mercenary: DemiDevimon Soulmon line)
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Rock
levels 11-18 Deputymon at Western Area East (mercenary: Deputymon)
levels 18-27 Icemon at Wind Valley (mercenary: Gotsumon)
levels 27-38 Megadramon at Ruined Historic (mercenary: MechaNorimon)
levels 35-43 SuperStarmon at Snowman Village (mercenary: Starmon and Deputymon)
levels 60-80 Rockmon at Maze Entrance
levels 60-80 CannonBeemon at Maze Entrance (mercenary: fanbeemon)
levels 60-80 Volcamon at Maze Entrance
levels 75-83 Gotsumon at Maze F1 (mercenary: Gotsumon)
levels 80-86 Icemon at Maze F2 (mercenary: Gotsumon)
levels 82-90 Meteormon at Maze F2 (mercenary: Gotsumon)
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Insect
levels 3-13 BlackGarurmon at Yokohama Village (this is not a typo BlackGarurmon drops insect eggs)
levels 11-19 Digmon at Western Village (mercenary: Drimogemon)
levels 16-26 Stingmon at Wilderness Area (mercenary: Wormmon)
levels 31-45 Okuwamon at Western Area West (mercenary: Kunemon)
levels 45-55 DarkWormmons at Dark Tower Wasteland (mercenary: Wormmon)
levels 75-82 Wormmon at Maze F1 (mercenary: Wormmon)
levels 80-86 Stingmon at Maze F2 (mercenary: Wormmon)
levels 82-90 JewelBeemon at Maze F3 (mercenary: Wormmon)
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Fire
levels 1-10 DemiMeramon at Yokohama Village (mercenary: DemiMeramon)
levels 6-17 Meramon at Yokohama Village (mercenary: DemiMeramon)
levels 11-16 Candlemon at Western Village (mercenary: Candlemon)
levels 46-57 Meramon at Silent Forest (mercenary: DemiMeramon)
level 75-82 Candelmon at Maze F1 (mercenary: Candlemon)
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Plant
levels 6-15 Mushroomon/Woodmon/Togemon at Western Village (mercenary: Mushroomon/Woodmon/Togemon)
levels 11-18 RedVegimon at Western Area Outskirts
levels 25-33 Blossomon at Digimon Farm (mercenary: Kiwimon)
levels 31-38 Cherrymon at Oil-Refinery-2 (mercenary: Woodmon)
levels 41-55 Lillymon at Silver Lake (mercenary: Palamon)
levels 80-86 Vegimon at Maze F2
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Aqua
levels 31-39 Ikkakumon at Frozen Ground (mercenary: Gomamon)
levels 39-49 Seadramon at Snowman Village (mercenary: Betamon)
levels 41-48 Betamon/Seadramon at Silver Lake (mercenary: Betamon)
levels 55-69 Vikemon at Distorted Data Village (mercenary: Gomamon)
levels 80-86 Seadramon at Maze F2 (mercenary: Betamon)
levels 82-90 MegaSeadramon at Maze F3 (mercenary: Betamon)
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Bird
levels 11-18 Birdamon at Western Area Outskirts (mercenary: Biyomon)
levels 16-21 Biyomon at Wilderness Area (mercenary: Biyomon)
levels 25-34 Aquaillamon/Garudamon at Ruined Historic (mercenary: Hawkmon/Biyomon)
levels 41-52 Birdamon at Silver Lake (Biyomon)
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Other methods :
1. MC2 if you kill the digimon that spawn from MC2 you will get a Min of 6 beast data and sometimes some rock data. Remember that you can trade the beast data you get for any other type of data
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2. I always hear people saying that Maze floors are a great place to farm data (I'm not sure about this because I haven't unlock Maze yet)
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3. Its always better to farm at digimon who drop mercenary eggs