InuYasha Episode 156: The Final Battle at the Graveside: Sesshomaru Versus Inuyasha!
Episode 156 of 167 of InuYasha, aired June 14, 2004, 24 minutes. Available with English subtitles and dub where released.
Episode summary
Naraku appears to steal Hosenki's shard, but Sesshomaru arrives on the scene, to everyone's surprise.