Kanto:
Red and Blue
FireRed and LeafGreen
Johto:
Gold, Silver, and Crystal
HeartGold and SoulSilver
Hoenn:
Ruby and Sapphire
Omega Ruby and Alpha Sapphire
Sinnoh:
Diamond and Pearl
Unova:
Black and White
Kalos:
X and Y
Alola:
Sun and Moon
Galar:
Sword and Shield