Collect all 175/175 chip except Dream Aura chip(No.127).
When you can get them all.Go to the deepest Internet Area(Internet Area 16 the area where you can get paradin sword).
Walk around that area until you find him.He can appear everywhere in that area.If you can beat him,he should give you the Dream Aura chip.
Please remember,he CAN'T give his chip to you[his navi chip]