[imlost]

So my save game for Pokemon Platinum didn't work but I think I know why. For some reason, the saved file was only 422 bytes (I thought i had set it to 512k, but I guess something happened).

The saves for any games that's created from no$gba are compressed by default, so you don't need to worry about this.

So if I set the settings to Flash 512k and save those settings, and save a game, then close the emulator completely, then boot up the emulator again and if the save-game works then, am I good?

Yes. Also, the save file will be updated when you reload the same game or load another game.

 

[imlost]

Hmm, I edited the .ini file to change the Compressed thing to Uncompressed (read somewhere on this board that it helped). My save file should be 512kb now right?

Yes, but I don't see why would you want to do that, unless you want to use pokesav.