>>51696273And yet Tajiri did it that way, your point is irrelevant as the creator wanted to let people know Ditto could facilitate breeding, due to its ability to copy other pokémon's genetic make-up.
That he also told Masuda to keep the ratio going forwards and Masuda deciding against putting Ditto in easy access (all other games lock you to waiting for Ditto, some till even post-game) because they don't want people trading endless starters away to fill their pokédex THAT handy (same reason they lock out Bank/Home compatibility for 3-4 months after launch).
There are ways and means around the limitation, but kids won't find them easy, which is the whole point of the way they do it.