D/P #7 made it quite clear that Hikari is training Pochama to do appeals, but she's not doing any training to teach it how to dance.We haven't seen a single DP contest in the anime yet. How do you know for sure they'll ignnore their features?
Using a different Pokemon in the appeal than battle isn't really a striking huge difference. Besides, GameFreak altered the Contests greatly for the new games and it would be a shame for the writers not to include the new features and just make them carbon copies of May's Contests.Hoenn contests had a distinction from Kanto contests.
If they're showing her training for basic appeals, and not mention a word of dancing in all of D/P so far, I doubt they're going to include the dancing. Having two appeals in each Contest, (one traditional and one dancing), in addition to the battle segment in addition to showing all the rival coordinators doing it in the same Contest would be a tight squeeze.Just because we have only seen one aspect of Hikari's training so far does not mean that it is all there is to contests. It's not as if we have seen her do any training for contest battles either.
Absense of evidence is not evidence of absense.