https://www.deviantart.com/kasaibou/art/Adventures-of-the-Regi-Trio-New-Regis-871450100
Well, this is awkward. In Gen III, we were introduced to Regirock, Regice, and Registeel which fans called the Regi trio. In Gen IV, we were introduced to Regigigas, the "Trio Master" of the Regis as well as their creator. In Gen VIII, Nintendo introduces us to Regidrago and Regieleki, so Regigigas must have created them too. But hey, a probable theory is that the Regis represent historic ages:
Regirock - Stone Age
Regice - Ice Age
Registeel - Iron Age
Regidrago - Medieval Age
Regieleki - Modern Age
That makes some sense.
Inspired by Haritsuki, creator of Adventures of the Regi Trio / Regimania
