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Heart Gold and Soul Silver: Egg Groups
Only Pokemon in the same group can produce an egg together. The egg will be the basic form Pokemon of the female parent.

Bug Group:
Ariados, Beautifly, Beedrill, Burmy, Butterfree, Cascoon, Caterpie, Combee, Drapion, Dustox, Flygon, Forretress, Gligar, Gliscor, Heracross, Illumise, Kakuna, Kricketot, Kricketune, Ledian, Ledyba, Masquerain, Metapod, Mothim, Nincada, Ninjask, Paras, Parasect, Pineco, Pinsir, Scizor, Scyther, Shuckle, Silcoon, Skorupi, Spinarak, Surskit, Trapinch, Venomoth, Venonat, Vespiquen, Vibrava, Volbeat, Weedle, Wormadam, Wurmple, Yanma, Yanmega

Dragon Group:
Altaria, Arbok, Bagon, Charizard, Charmander, Charmeleon, Dragonair, Dragonite, Dratini, Ekans, Feebas, Gabite, Garchomp, Gible, Grovyle, Gyarados, Horsea, Kingdra, Magikarp, Milotic, Salamence, Sceptile, Seadra, Seviper, Shelgon, Swablu, Treecko

Fairy Group:
Azumarill, Blissey, Breloom, Castform, Chansey, Cherrim, Cherubi, Clefable, Clefairy, Delcatty, Froslass, Glalie, Granbull, Hoppip, Jigglypuff, Jumpluff, Marill, Mawile, Minun, Pachirisu, Pikachu, Plusle, Raichu, Roselia, Roserade, Shroomish, Skiploom, Skitty, Snorunt, Snubbull, Togekiss, Togetic, Wigglytuff

Flying Group:
Aerodactyl, Altaria, Chatot, Crobat, Dodrio, Doduo, Farfetch'd, Fearow, Golbat, Honchkrow, Hoothoot, Murkrow, Natu, Noctowl, Pelipper, Pidgeot, Pidgeotto, Pidgey, Skarmory, Spearow, Staraptor, Staravia, Starly, Swablu, Swellow, Taillow, Togekiss, Togetic, Wingull, Xatu, Zubat

Ground Group:
Absol, Aipom, Ambipom, Ampharos, Arbok, Arcanine, Bibarel, Bidoof, Blaziken, Buizel, Buneary, Camerupt, Chimchar, Combusken, Cyndaquil, Delcatty, Delibird, Dewgong, Diglett, Donphan, Dugtrio, Dunsparce, Eevee, Ekans, Electrike, Empoleon, Espeon, Exploud, Farfetch'd, Flaaffy, Flareon, Floatzel, Furret, Girafarig, Glaceon, Glameow, Golduck, Granbull, Growlithe, Grumpig, Hippopotas, Hippowdon, Houndoom, Houndour, Infernape, Jolteon, Kecleon, Leafeon, Linoone, Lopunny, Loudred, Lucario, Luxio, Luxray, Mamoswine, Manectric, Mankey, Mareep, Mawile, Meowth, Mightyena, Miltank,Monferno, Nidoking, Nidoran (F), Nidoran (M), Nidorino, Ninetales, Numel, Nuzleaf, Pachirisu, Persian, Phanpy, Pikachu, Piloswine, Piplup, Ponyta, Poochyena, Primeape, Prinplup, Psyduck, Purugly, Quagsire, Quilava, Raichu, Rapidash, Raticate, Rattata, Rhydon, Rhyhorn, Rhyperior, Sandshrew, Sandslash, Sealeo, Seedot, Seel, Sentret, Seviper, Shiftry, Shinx, Skitty, Skuntank, Slaking, Slakoth, Smeargle, Sneasel, Snubbull, Spheal, Spinda, Spoink, Stantler, Stunky, Swinub, Tauros, Teddiursa, Torchic, Torkoal, Typhlosion, Umbreon, Ursaring, Vaporeon, Vigoroth, Vulpix, Wailmer, Wailord, Walrein, Weavile, Whismur, Wooper, Zangoose, Zigzagoon

Humanshape Group:
Abra, Alakazam, Buneary, Cacnea, Cacturne, Chimchar, Croagunk, Drowzee, Electabuzz, Electivire, Hariyama, Hitmonchan, Hitmonlee, Hitmontop, Hypno, Illumise, Infernape, Jynx, Kadabra, Lopunny, Lucario, Machamp, Machoke, Machop, Magmar, Magmortar, Makuhita, Medicham, Meditite, Monferno, Mr. Mime, Sableye, Spinda, Toxicroak, Volbeat

Indeterminate Group:
Banette, Castform, Chimecho, Drifblim, Drifloon, Dusclops, Dusknoir, Duskull, Gallade, Gardevoir, Gastly, Gastrodon, Gengar, Grimer, Gulpin, Haunter, Kirlia, Koffing, Magcargo, Misdreavus, Mismagius, Muk, Ralts, Shellos, Shuppet, Slugma, Spiritomb, Swalot, Weezing, Wobbuffet

Mineral Group:
Froslass, Geodude, Glalie, Golem, Graveler, Nosepass, Onix, Probopass, Snorunt, Steelix, Sudowoodo

Monster Group:
Abomasnow, Aggron, Ampharos, Aron, Bastiodon, Bayleef, Blastoise, Bulbasaur, Charizard, Charmander, Charmeleon, Chikorita, Cranidos, Croconaw, Cubone, Exploud, Feraligatr, Flaaffy, Gabite, Garchomp, Gible, Grotle, Grovyle, Ivysaur, Kangaskhan, Lairon, Lapras, Larvitar, Lickilicky, Lickitung, Loudred, Mareep, Marowak, Marshtomp, Meganium, Mudkip, Nidoking, Nidoran (F), Nidoran (M), Nidorino, Pupitar, Rampardos, Rhydon, Rhyhorn, Rhyperior, Sceptile, Shieldon, Slowbro, Slowking, Slowpoke, Snorlax, Snover, Squirtle, Swampert, Torterra, Totodile, Treecko, Tropius, Turtwig, Tyranitar, Venusaur, Wartortle, Whismur

Plant Group:
Abomasnow, Bayleef, Bellossom, Bellsprout, Breloom, Bulbasaur, Cacnea, Cacturne, Carnivine, Cherrim, Cherubi, Chikorita, Exeggcute, Exeggutor, Gloom, Grotle, Hoppip, Ivysaur, Jumpluff, Lombre, Lotad, Ludicolo, Meganium, Nuzleaf, Oddish, Paras, Parasect, Roselia, Roserade, Seedot, Shiftry, Shroomish, Skiploom, Snover, Sunflora, Sunkern, Tangela, Tangrowth, Torterra, Tropius, Turtwig, Venusaur, Victreebel, Vileplume, Weepinbell

Water 1 Group:
Azumarill, Bibarel, Bidoof, Blastoise, Buizel, Clamperl, Corphish, Corsola, Crawdaunt, Croconaw, Delibird, Dewgong, Dragonair, Dragonite, Dratini, Empoleon, Feebas, Feraligatr, Floatzel, Gastrodon, Golduck, Gorebyss, Horsea, Huntail, Kabuto, Kabutops, Kingdra, Lapras, Lombre, Lotad, Ludicolo, Mantine, Marill, Marshtomp, Masquerain, Milotic, Mudkip, Octillery, Omanyte, Omastar, Pelipper, Piplup, Politoed, Poliwag, Poliwhirl, Poliwrath, Prinplup, Psyduck, Quagsire, Relicanth, Remoraid, Seadra, Sealeo, Seel, Shellos, Slowbro, Slowking, Slowpoke, Spheal, Squirtle,Surskit, Swampert, Totodile, Walrein, Wartortle, Wingull, Wooper

Water 2 Group:
Barboach, Carvanha, Chinchou, Finneon, Goldeen, Gyarados, Lanturn, Lumineon, Luvdisc, Magikarp, Octillery, Qwilfish, Relicanth, Remoraid, Seaking, Sharpedo, Wailmer, Wailord, Whiscash

Water 3 Group:
Anorith, Armaldo, Cloyster, Corphish, Corsola, Cradily, Crawdaunt, Drapion, Kabuto, Kabutops, Kingler, Krabby, Lileep, Omanyte, Omastar, Shellder, Skorupi, Tentacool, Tentacruel

Ditto Group:
Baltoy, Beldum, Bronzong, Bronzor, Claydol, Electrode, Lunatone, Magnemite, Magneton, Magnezone, Manaphy, Metagross, Metang, Phione, Porygon, Porygon2, Porygon-Z, Rotom, Shedinja, Solrock, Starmie, Staryu, Voltorb

No Egg Group:
Arceus, Articuno, Azelf, Azurill, Bonsly, Budew, Celebi, Cleffa, Cresselia, Darkrai, Deoxys, Dialga, Ditto, Elekid, Entei, Giratina, Groudon, Happiny, Heatran, Ho-oh, Igglybuff, Jirachi, Kyrogre, Latias, Latios, Luigia, Magby, Mantyke, Mesprit, Mew, Mewtwo, Mime Jr., Moltres, Munchlax, Nidoqueen, Nidorina, Palkia, Pichu, Raikou, Rayquaza, Regice, Regigigas, Regirock, Registeel, Riolu, Shaymin, Smoochum, Suicune, Togepi, Tyrogue, Unown, Uxie, Wynaut, Zapdos