If Dawn did return, how would this impact Pearlshipping and what kind of scene would you like to see between them?
I would see Dawn returning during the Kalos League to cheer Ash on. Ash is struggling and is about to lose, but to his surprise, he sees Dawn cheering him on. He takes Dawn's encouragement and uses that to advance to the next round. Ash and Dawn meet up after the battle and exchange a double high five. They share stories of their journey after they part ways at the end of DP. Meanwhile, Serena mistakens Ash and Dawn's relationship to be romantic and grows jealous, though she doesn't realize that Dawn is also oblivious. Similar to Lyra asking Dawn if she ever considered Ash to be her boyfriend, Serena asks Dawn if they're a couple. Dawn gets all flustered and blushes, commenting how another person asked her a similar question.
Personal ratings of the anime
Orange Islands: 7.5/10
Battle Frontier: 8.5/10
Diamond & Pearl: 8.5/10
Best Wishes: 3/10
XY: 8.75/10 (Subject to be changed)