This is the cheat code database which i know is the latest i got thats for the R4..So you can put this in the cheat code folder in your DSTT and activate away.Im positive you can find the cheat you've been looking for, for YuGiOh 2008.. Enjoy!
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi