WaterShuriken
"I..I..Iron Tail, Pikachu."
I'm pretty sure there won't be a new opening for Da! in the dub. Adventures in Unova is the last dub season, but they could alter the shots and clips in the opening once it starts to make it fit more. It would be awkward if we have all of the League championship characters in the opening in the middle of Ep. N and when they're going back to kanto.
Although Adventures in Unova doesn't seem suited to the Decorola Islands.