As the PS2 version is the only one with proper 16:9 widescreen, this cheat brings widescreen to the Gamecube version. This cheat has been tested on the NTSC version, but is stated to be region free.
Tomb Raider: Legend has a graphical bug, as documented in the issue report here https://bugs.dolphin-emu.org/issues/13749?next_issue_id=13748 This .ini entry fixes the issue.
MackdannyTwitch