How can you costumize characters on sonic adventure DX

you need a program called PVMEdit then go to your sonic adventure dx folder then go to system

then get SONIC.PVM copy it to PVMEdit then open PVMEdit and click on open then choose SONIC.PVM then do whatever u want then click on save a message will come click on no then change the other SONIC.PVM to any other name then copy the other PVM in the PVMEdit folder to the sonic adventure dx folder in system