If you grind the game like crazy and have a map that helps. That is what I do and it pays off for completists like myself. For example yesterday I grinded and rode around for 5 hours and evolved a metagross only hours after this recent group was dropped.
I have two Wailords with one being perfect IV,
6 walrien, 3 milotec, 1 perfect feebas with about 80 candies, 4 Gardevoir with one being perfect. It is doable youjust have to grind, find nests and maps help.