I have not had much luck locating these, often due to links not working:

(Albums with an X by them are in my possession now)
Pokemon Ruby/Sapphire Super Music Collection
Pokemon Diamond and Pearl SMC X
Pokemon Fire Red/Leaf Green SMC
Pokemon X and Y SMC
Super Robot Taisen J X

I prefer the albums in mp3 format and would prefer to download an entire album at once if possible. Thanks.

Pokemon Ruby/Sapphire Super Music Collection
Pokemon Diamond and Pearl SMC
Pokemon Fire Red/Leaf Green SMC
Pokemon X and Y SMC
You could try using the search function on the forum or even Google for these. They're practically everywhere. Here's X/Y (Thread 164653).

Every link I found would not work. At least with Chrome anyways. Any leads on the others by chance?