>>35003740If you were to start now, a long fucking time
If you've been watching since the beginning, it doesn't take much to stay up to date.
It also helps that each series is pretty much self-contained. Instead of dividing it up into "seasons" like the west does, Japan instead divides it up into "series".
Original Series: Kanto, Orange Islands, and Johto
Advanced Generation series: Hoenn and Battle Frontier
Diamond & Pearl series: Sinnoh
Best Wishes series: Unova and Decolore Islands
XY series: Kalos
Sun & Moon series: Alola