Uh I see this happening though, because they gave some of the breeding items (sea incense and lax incense) late in the ruby and sapphire game, and why would you breed if you already have the evolution of it, the only reasons are to complete your dex or you really like the baby. So I think they will have some pokemon in the wild.
I want to say to some of the posts above, you can't say in that game it was that way, so it is that way in this game, because games are different.
Otherwise I can say , gold and silver was the first game with baby pokemon, so there were to less babies to make them wild, in ruby and sapphire whynaut was wild, so we can expect more wild baby pokemon in this game (because it is an increasing line).
both parts are just not good arguments