While no game ever offers all Pokemon, there are always Pokemon from different generations available. Any given game wont only have Pokemon of that generation. I am not saying that it makes me happy, but at least you can have some older (better) Pokemon in the newer games.
They aren't necessary in an adventure game, but in a role playing game, where you make decisions and the world interacts with you differently based on the paths you have chosen, yes, they are entirely necessary.
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