"Moonlight strikes the Legendary Giants as the second generation grows fatter and slower than his preevolution. Carrying their children to bed."
~ Clue for current pokemon required for regi's:
https://forums.pokemonblazeonline.com/threads/sage-eron-regitrio.2275/
Sage Eron
Sage Eron is an NPC who starts a side quest which will unlock the regitrio NPC's.
Requirements
Route 120 Hoenn reachable
Hoenn Story finished (for second part)
A Trio of pokemon resembling the Regi's (for very last part)
Quest
Upon entering Route 120 for the second time, you can...