I've completed living dexes in gens 1 and 2 thus far, and I'm working on beating Gale of Darkness for gen 3, where I'm making it a living dex.
>>37454529The most optimal setup for each gen, with minimal transfers, is:
>gen 1Red and Green.
>gen 2Gold and Silver + any gen 1 game.
>gen 3Emerald, LeafGreen, Colosseum, Gale of Darkness.
>gen 4Diamond, Pearl, HeartGold, SoulSilver + any gen 3 Hoenn game (for Tropius and the Regis)
>gen 5Black, White, Black 2, White 2 + Diamond, Pearl, HeartGold, SoulSilver.
>gen 6X, Y, Omega Ruby, Alpha Sapphire.
>gen 7Sun or Moon (for island scan Unova Pokemon), Ultra Sun, Ultra Moon + X, Y, Omega Ruby or Alpha Sapphire