Here is a quick list of what hatching an egg might get you!
2 km eggs (200 experience per 2 km egg hatched)
- Bulbasaur
- Caterpie
- Charmander
- Clefairy
- Geodude
- Jigglypuff
- Magikarp
- Pidgey
- Pikachu
- Rattata
- Spearow
- Squirtle
- Weedle
- Zubat
5 km eggs (500 experience per 5 km egg hatched)
- Abra
- Bellsprout
- Cubone
- Diglett
- Doduo
- Drowzee
- Ekans
- Exeggcute
- Farfetch’d
- Gastly
- Goldeen
- Grimer
- Growlithe
- Horsea
- Kangaskhan
- Koffing
- Krabby
- Lickitung
- Machop
- Magnemite
- Mankey
- Meowth
- Mr. Mime
- Nidoran♀
- Nidoran♂
- Oddish
- Paras
- Poliwag
- Ponyta
- Porygon
- Psyduck
- Rhyhorn
- Sandshrew
- Seel
- Shellder
- Slowpoke
- Staryu
- Tangela
- Tauros
- Tentacool
- Venonat
- Voltorb
- Vulpix
10 km eggs (1000 experience per 10 km egg hatched)
- Aerodactyl
- Chansey
- Dratini
- Eevee
- Electabuzz
- Hitmonchan
- Hitmonlee
- Jynx
- Kabuto
- Lapras
- Magmar
- Omanyte
- Onix
- Pinsir
- Scyther
- Snorlax