For broader game editing beyond the BAL mode, many players use the PES 2013 Ultimate Editor which supports:

Always back up your BAL01.bin file before editing. One wrong click—like giving yourself a “7” weak foot accuracy—and your player might start kicking with their nose. Also, don’t max everything to 99 on your first season. You’ll score 5 goals a game, get bored by October, and end up starting a new save as a goalkeeper just to feel something again.

PES 2013 BAL Editor V1.4.zip is a third-party modding utility designed for the "Become a Legend" (BAL) mode in Pro Evolution Soccer 2013