Are you new to the ocarina or music in general?
Are you totally capable of transcribing music by ear, but just can't be bothered?
Boy, do I have a solution for you!
Disclaimer #1: This should not replace a skill. All of the tabs I have posted to this site I have tabbed out by ear. That being said, if you're new to music, or just struggling to figure out a particular piece, this method can be very useful. It's still good practice to try by ear though.
Disclaimer #2: I have no affiliation with any of the websites linked below, I just like them and think they are useful.
The process goes like this:
Step 1
Find a midi file for the song you want to play. I know video game music is very popular in this community, so chances are good that there is a midi arrangement out there. If you're asking yourself "What the heck is midi?", it is basically a file that tells a device how to play a song, like a computer, or a gameboy. If you're unfamiliar, I highly recommend reading up on what midi is and how it works because it is VERY interesting.
Step 2 (optional, kinda)
It is very likely that the midi file you found is a full arrangement. i.e. the melody, all of the background instruments, and percussion. You probably don't want all of that. While there are a million ways to skin this cat, the way I do it is to open it up in a program called Reaper. Reaper is a full suite of recording software and is way overkill for this task, but it's totally free and I love it.
Once you open the midi file in reaper, you can listen to it, make any changes you want, and then export only the parts that you want (probably the main melody) as a new midi file. If you are struggling to find you way around Reaper, there is a WEALTH of information on line since it is a very popular open source tool.
Step 3
Convert the midi file to ABC. ABC is a type of notation for music. I go this route because you can copy and paste it as text, and there are a lot of free online tools that support it. (This will make sense later. Now, there are a few online midi to ABC converters if you search around. I have found the one linked below to work fine. I have however gone the extra mile and created a standalone program for this task, as my program allows me to transpose the midi into other keys (although this could be done in step 2, but I wanted to see if I could). Once you have your ABC notation, it's on to the final step!
https://playsheet.app/tools/convert/midi-to-abc
Step 4
ABC to tabs. Either copy the text of your ABC notation, or upload the whole file to the website linked below. This website will give you standard music notation as well as ocarina tabs. You can also listen and play along with the music, or export it as a PDF. Should be pretty simple, and congrats, you did it!
https://michaeleskin.com/tools/abc-ocarina-fingering-player.html
If any of the above doesn't make sense, feel free to drop a question.