Alright lets do this. You can only pick two for each tier. Main title games should make up 75% of your decision. Remaining 25% is for side games.

I say;
Bro Tier: Gen 2 and 4
Mid Tier: Gen 1 and 6
WTF Tier: Gen 3 and 5

Prove me wrong.
Hard Mode: You have to actually defend choices without >MAYMAYS or >MUH NOSTALGIA.