This guide will show you how to add the Pokemon cry sounds into PKHeX. With this feature, every time you hover over a Pokemon in PKHeX, it's cry will play.
1. In the same folder that PKHeX is located, create a new folder called "sounds"
2. Place your Pokemon cries into the "sounds" folder. Make sure the cries are in the ".wav" format with the following naming format.
1.wav = Bulbasaur
649.wav = Genesect
Pokemon with different cries for alternate forms are
492.wav = Shaymin
492-1.wav = Shaymin Sky Form
3. Open PKHeX and verify that the cries are being played properly by hovering your mouse cursor over a Pokemon in any box. If the cry does not play, verify that you are running the latest build of PKHeX. Also verify that the "Play PKM Slot Cry on Hover" setting is turned on by going to "Options>>Settings"