There are four tiers of rarity within each Egg group.
When a Trainer visits a PokéStop, they have a chance to obtain an Egg. If they are eligible, a random Pokémon will be selected from the table below. The randomly selected Pokémon will determine the egg distance required to hatch.
|Tier|| 2 km Egg|
| 5 km Egg|
| 10 km Egg|
|8.4% — Nidoran♀, Nidoran♂, Geodude, Krabby, Pichu||6.0% — Poliwag, Ponyta, Phanpy||0.0% — None|
|4.2% — Oddish, Diglett, Abra, Machop, Slowpoke, Gastly, Exeggcute, Spinarak, Cleffa, Igglybuff, Togepi, Aipom, Slugma||3.0% — Growlithe, Shellder, Drowzee, Voltorb, Cubone, Rhyhorn, Eevee, Chinchou, Natu, Marill, Hoppip, Wooper, Swinub, Mantine, Stantler, Tyrogue, Smoochum, Elekid, Magby||15.4% — Porygon, Dratini, Mareep, Larvitar|
|2.1% — Remoraid||1.5% — Seel, Onix, Tangela, Scyther, Pinsir, Chikorita, Cyndaquil, Totodile, Snubbull, Teddiursa, Houndour||7.7% — Chansey, Sudowoodo, Skarmory|
|1.1% — Misdreavus||0.8% — Grimer, Lickitung, Koffing, Omanyte, Kabuto, Pineco, Gligar, Qwilfish, Sneasel||3.8% — Lapras, Aerodactyl, Snorlax, Miltank|
|0.0% — None||0.4% — Wobbuffet, Girafarig, Dunsparce, Shuckle||0.0% — None|
In regards to the percentage values:
- In the column headers, the overall percentage of receiving a Pokémon in that Egg group.
- In the Tier column, is the overall chance of receiving a Pokémon of that rarity.
- In each cell, the individual chance of receiving that Pokémon within the Egg group.
- Cracked Eggs: The Secret Rarity Tiers of Pokemon GO Egg Species. The Silph Road.
- Chart of Egg Rarity Divided by Egg Distance.. /r/TheSilphRoad.
- Calculated Percentage Chance of a Particular Pokemon Given Egg Type.. /r/TheSilphRoad. Retrieved on 2017-03-10.
- New egg chance and egg spreadsheet. /r/TheSilphRoad. Retrieved on 2017-03-10.
- New Changes to Egg Species: June 2017. The Silph Road. Retrieved on 2017-06-01.
- New Changes to Egg Species: September 2017. The Silph Road. Retrieved on 2017-09-05.