Togepi was originally Ash's pokemon anyway, so do you think that it would have been handled better if he did raise it instead of Misty? Since Ash actually battles wit his pokemon then I'm sure that the little egg pokemon would have learned some decent moves and possibly evolved in Johto at some point. It probably would have gotten Oaked after Johto but then when DP came around maybe Ash could have gave or traded Togepi(tic) to Dawn so that it could have evolved into Togekiss later on.
That's just how I could have seen it happening. Do you think Togepi should have been raised by Ash, or was it better off with Misty? Do you think it would have been exactly the same regardless of whether Ash or Misty kept it?