After the line that load 'MetadataPlayerA', the meta variables uses the metadata.txt files in order, so meta[0] is the trainertypes internal number, meta[1] is the walk name graphics, the meta[2] is the player on bicycle graphics and so on. Simply change it to load the graphics created by your system.
I see you question with Maruno. The way to making the player graphic was not depending on the Metadata players you have to edit the script that mentions 'MetadataPlayerA'.
Sorry, Ive been pretty busy latley. Oh, and my school has started so Im focusing on that aswell. Ill go on only during weekends, so if you catch me online we can have a chat.