Are you asking why your Smeargle no longer has Ice Punch?
If you are:
- If your Smeargle has a full set of moves, it may have lost the move Ice Punch as it grew to level 21/31/41/51/61/71/81/91, and therefore Ice Punch got replaced for Sketch.
- You may have simply failed to put Ice Punch on your Smeargle. In Wi-Fi battles all Sketched Moves do not get permanently sketched, also in Battle Towers, Maisons and Subways etc.
You've got Sketch back - simply get Ice Punch back on your Smeargle and breed again, to get your Ice Punch Scraggy.
Hope I helped. :)