I only played pokémon black and white and a little bit of pokémon go
I don't really have an opinion on pokémon related subjects anymore but if I had to choose it would be the black and white series
I'd say Emerald, so I thoroughly enjoyed ORAS, but gen 5 holds my favorite poke, so I'm pretty torn. S/M; US/UM are fun, but not as much as ORAS, imo.
Aaaaaa, but Sinnoh!
Dammit, I like all of them.
Emerald was my favorite for sure, I'll never forget climbing that tower for Rayquaza in some random restaurant when I was like 6. I think I spent the most time in Diamond though