Each Pokémon egg needs a different amount of steps to hatch. Since the Pokémon that hatches out of is either a baby or the first form of a Pokémon, only those are listed. For easier searching, use Ctrl + F.

Hatching eggs is easier if you have a Pokémon in your party with the ability Flame Body or Magma Armor, as these ability halve the number of steps it takes for a Pokémon egg to hatch. Pokémon such as Slugma or Torkoal usually have this ability.

Magikarp

Bidoof, Burmy, Caterpie, Combee, Corphish, Geodude, Hoothoot, Illumise, Kricketot, Ledyba, Lotad, Nincada, Pidgey, Poochyena, Rattata, Seedot, Sentret, Shroomish, Skitty, Slakoth, Spearow, Spinarak, Spinda, Starly, Surskit, Taillow, Volbeat, Weedle, Wormadam, Wurmple, Zigzagoon, Zubat

Abra, Aipom, Baltoy, Barboach, Bellsprout, Bonsly, Bronzor, Budew, Buizel, Bulbasaur, Buneary, Cacnea, Carvanha, Charmander, Chatot, Cherubi, Chikorita, Chimchar, Chinchou, Clamperl, Corsola, Cubone, Cyndaquil, Delibird, Diglett, Ditto, Doduo, Drowzee, Dunsparce, Ekans, Electrike, Exeggcute, Farfetch'd, Feebas, Finneon, Gastly, Girafarig, Glameow, Gligar, Goldeen, Grimer, Growlithe, Gulpin, Hoppip, Horsea, Houndour, Kangaskhan, Kecleon, Koffing, Krabby, Lickitung, Luvdisc, Machop, Magnemite, Makuhita, Mankey, Mareep, Mawile, Meditite, Meowth, Miltank, Minun, Mudkip, Murkrow, Natu, Nidoran F, Nidoran M, Nosepass, Numel, Oddish, Paras, Phanpy, Pineco, Piplup, Plusle, Poliwag, Ponyta, Porygon, Psyduck, Qwilfish, Ralts, Remoraid, Rhyhorn, Rotom, Seel, Seviper, Shellder, Shellos, Shinx, Shuckle, Skorupi, Slowpoke, Slugma, Smeargle, Sneasel, Snorunt, Snover, Snubbull, Spheal, Spoink, Squirtle, Stantler, Staryu, Stunky, Sunkern, Swablu, Swinub, Tangela, Tauros, Teddiursa, Tentacool, Torchic, Torkoal, Totodile, Trapinch, Treecko, Turtwig, Voltorb, Vulpix, Whismur, Wingull, Wooper, Wynaut, Yanma, Zangoose

Absol, Carnivine, Castform, Chingling, Duskull, Elekid, Heracross, Lunatone, Magby, Mantyke, Mime Jr., Misdreavus, Onix, Pinsir, Riolu, Sableye, Sandshrew, Scyther, Shuppet, Skarmory, Smoochum, Solrock, Tropius, Tyrogue, Venonat

Anorith, Cranidos, Drifloon, Hippopotas, Kabuto, Lileep, Omanyte, Shieldon, Spiritomb

Bagon, Beldum, Dratini, Gible, Happiny, Lapras, Larvitar, Munchlax, Phione, Relicanth, Wailmer