Give him the gold paint and Parn'll join the party. To get the paint, you must first get the tailoring shop to appear in Sindain in the future. You can then go up to the golden eggs (in the future) and get the golden paint. You can also buy it in the tailoring shop (in the future) for 1000 gilda. Then give the gold paint to Parn and he makes Julia come alive and you aquire both Parn and Julia.