Pixelmon Mod

So i am able to use the /playsound command for normal record discs just fine with no issues. When it comes to the Pixelmon discs though I can not seen to get it to play anything. I try the item ID name listed on the wiki and even with the full name there as well. Has anyone had any luck getting this to work? Is it even possible? I really appreciate it.

You need to use the name as it is registered in the sounds.json

where is this folder contained for pixelmon sounds. I for the life of me can not locate anything but the basic minecraft sounds.

in the pixelmon jar. assets/pixelmon/sounds.json