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The site is wrong-ish, I had the mission before I went to Groundon's dungeon, the only requierment is to have a house (plus first flag) and have Sky Blue Plains.
That's strange. I got the Smeargle mission right after I remodled my rescue base. Make sure you have the Sky Blue Plains friend area and when you do, do a few random missions.
Get the Sky Blue Plains friend area, and go to the Pelliper Post Office.
And if you see "Howling Forest" on the Bulletin Board, accept it,
And you'll go to Howling Forest and rescue Smeargle!