Data-Riku is a boss who is fought in Kingdom Hearts coded and Kingdom Hearts Re:coded. A stronger bugged form of him appears on the 100th floor of the Avatar Sector in the Avatar Menu of Kingdom Hearts Re:coded.
During the first phase, Data-Riku only has a small selection of moves which he doesn't use in quick succession. He uses simple lunge and slashes that can be blocked with the correct timing. He has a Dark Shield similar to Kingdom Hearts 358/2 Days which also reacts the same way if Sora attempts to attack the shield. Sora can either heal while his shield is up, or get behind him and attack. Also, be careful when using combo since Data-Riku will sometimes block and counter the finishing move. Keep watching his pattern and Data-Riku will fall with ease.
In the second phase, Data-Riku gains access to a new attack. Sometimes when there is some distance between Sora and Data-Riku, he will teleport above the ground near Sora and slams his Soul Eater below, sending seven Danger Blox and a Prize Blox outwards. While the Prize Blox poses no threat, the Danger Blox can cause damage. Use the same strategy as before, blocking then attacking. If he teleports into the middle of the air, quickly Dodge Roll away, or try and jump over the Blox, but this requires great timing.
Another strategy to overcome this technique is to immediately Lock-On to him after he teleports, that way Sora can easily dodge the Danger Blox with simple movements. The map on the touch screen can also be utilized since Blox are colored grey on the map so Sora can avoid the grey dots to avoid getting hit by the Blox.
In this phase, Data-Riku stops holding anything back and his stats improve. His strongest move Dark Aura, is now put into play. Similar to how it used in Kingdom Hearts and Kingdom Hearts: Chain of Memories, Data-Riku charges around the screen teleporting using his dark powers finishing with a slam which sends out a pulse of dark energy. This move is best dodged as it is hard to tell where he will emerge next.
Be prepared for it when he rises into the air and shouts, "Just try to keep up!" Pay attention to how many times he teleports, avoid the attacks with Dodge Roll and after the fifth time, immediately jump for the finishing blow. Block can also be used to defend against his teleport rush attack, but the ability Round Block must also be learned and his finishing move can't be blocked. He can also fire three Dark Firaga, which can be blocked easily. he uses the same attacks as the previous phases to be sure to block or dodge accordingly.
While debugging Data-Riku, a portal opens to a facsimile of the Chapel, where the Bugs have taken Data-Riku's form. This Data-Riku follows the same pattern as the Third phase, but he has an extra bar of health.