for the remaster, the CD reading system is replaced with a built in searchable Song List. This is how you can play it on Mobile, Switch, Steam etc. The Song List doesn't exactly equate to original CDs (the function is mechanically different) but there are a handful of entries that equate to their originals (this accounts for about 0.01% of entries within the 664,909 that create their original monsters.

The good news is, Everyone now has access to the entire game and can raise any monster they want to (once they're unlocked, of course), and the Song List is 100% solved and published. You can Random Button if you like the surprise, but if you want something specific, you can just view the published Song List, Pick your Monster Main/Sub, then pick the Title/Artist suggestion for the variant you want. :)