If you go back to replay to older games, such as HGSS, they only included pokmon from the first couple of generations because those were the only pokmon available. Nowadays, ROM hackers recreate such past games to include pokmon from the most recent generations. While on the other hand some people think there's way too many pokmon and believe pokmon from certain generations are better than other generations.
If you had to create a game with including certain generations of pokmon, what generations would you choose? Why so? Would you include certain lines or legendaries? What would they be?
For me, I would choose just pokmon from generations 1-4 even though I adore some of the newest pokmon. All of the pokmon within those generations have this simplistic balance which made each line and legendary a bit more special imo.