Steel Egg

The Steel Egg spawns Steel-type Pokémon around you for 5 minutes. Catch as many as you can to charge the egg and improve your final reward. 
 Spawns 
 The following Pokémon will spawn around you during the egg: 
 
 Diglett (Alolan) 
 Meowth (Galarian) 
 Magnemite 
 Aron 
 Beldum 
 Klink 
 Honedge 
 Durant 
 Klefki 
 Cufant 
 Tinkatink 
 Varoom 
 Shieldon 
 Bronzor 
 Togedemaru 
 
 Final Reward Pool 
 If you don't hit the Legendary odds, you'll receive one of these Pokémon: 
 
 Steelix 
 Scizor 
 Aggron 
 Metagross 
 Empoleon 
 Lucario 
 Bastiodon 
 Magnezone 
 Probopass 
 Klinklang 
 Aegislash 
 Corviknight 
 Perrserker 
 Tinkaton 
 Gholdengo 
 Revaroom 
 Orthworm 
 
 Legendary Rewards 
 If you hit the Legendary odds, you'll receive one of: 
 
 Registeel 
 Celesteela 
 Dialga 
 Dialga (Origin Forme)