Eh, Pokémon Go is nothing like mainline games... it seems to only share some classic elements, but the core gameplay is very different.
Anyway, like people said, Gen 2 is a good start. I started with Pokémon Silver as well.
Bet with Teeqoz for 2 weeks of avatar and sig control that Super Mario Odyssey would ship more than 7m on its first 2 months. The game shipped 9.07m, so I won