Go to ten manga.com for the full story

Here's the link that OP was talking about. I'm not sure about the first 120 or so chapters because I didn't read them online, but between this site's chapter 264 and 265, there are two chapters missing about the final battle between Marco and Luchist. These missing chapters are labeled 265 and 266 on mangago so after reading 264, come back to read the two chapters and then go back
http://www.tenmanga.com/book/Shaman+King.html