Please don't just use your nostalgia glasses for this haha, don't think about your memories for this question
By generation I mean the Pokèmon in that gen and the region
Gen 3 is my favourite because it has so many fantastic Pokèmon and only a few bad ones, gen 1 especially has a LOT of just trash and lazily done Pokèmon
I also love the Hoenn region, the layout is brilliant and it is just a fun and beautiful region
Silver was my favorite, I liked yellow but silver had both regions and you just about got to play two games worth, not to mention you could have the coolest ones from the first generation
My real team for silver was just three Pokémon, a Mewtwo with Recover, ice beam, psychic, and thunderbolt, as well as a Lugia with Recover, Aeroblast, Psychic and Thunderbolt, followed up by Jolteon with Pin Missile, Shadow Ball, Thunder, and Thunderbolt