Will Pokemon Best Wishes Episodes 23 and 24 ever air?

You are likely referring to the episodes that were never actually made.

Here's the breakdown:

* The planned episodes (23 & 24) would have been part of the *Best Wishes* series of the anime.

* They were never produced due to the Tohoku earthquake and tsunami in Japan in 2011.**

* These episodes would have continued the storyline with Ash, Iris, and Cilan.

* Instead of these specific episodes, the anime moved directly into the *Best Wishes!* series.

Therefore, these episodes are not available and will never be aired.