I know this game is old but a long time ago I believe I was the first to mod it. Due to the fact that I only made my score was 253 or something like that. I received message by numerous people and they constantly asked me "How did you get that high of a score, you can't reach that score" well unfortunately, they didn't know anything about modding or hex editing in general or they would be able to do something this easy.
Note: I did make this tutorial a long time ago so it might be a little bit hard to explain because I was a semi noob at hex editing.
1) Find how much medallions you have.
2) Next go to this site or do the hex to decimal by yourself. - Resigner: like I said I was a semi noob, you could just search up integers.
3) First box just enter your medallions numbers.
4)Once you get the value of your medallion, open up sav1.sav into hex editor.
5) Hit CTRL+F, enter in your hexadecimal
6) Once you find the values edit the values on the left side.
7)Change your values to FA or how many medallions you would like to have. - Resigner: You could just max it out by putting 7FFFFFFF but I wouldn't recommend it.