>>51299928>gonna catch em allYes, that's the point. Just because you need to trade with other players, or yourself with another game, doesn't mean you can't catch them all. Hell, Gen 4 introduced the ability to trade online with other people, so yes, you can in fact catch them all.
>transferring pokemonThis has always been a feature of Pokémon. In fact, the one time they didn't do it they're on record as saying "Holy shit let's not do that again," you know, around the time they decided to do it again.
>new game contentThis has been a series staple since Crystal, arguably G/S if you count Kanto and Red. And every game since Crystal has had a post game facility of some sort, because Crystal made it a staple.
A feature doesn't have to be introsuced from the start of the series to be a staple, like your argument implies.