If I want to complete a Black 2 living dex, which games are required?

I have already completed my living dex in Pokémon Home and I wanted to challenge myself by going back and doing it the old school way. I can’t find the answers I’m looking for by googling so I was hoping someone here could help me. I have all gen 3-5 games and multiple systems for trading purposes. Which particular Pokémon are exclusive to each game? Thank you in advance.