tenmanga.com has it but the quality is really bad
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You can read Yu-Gi-Oh! GX manga chapter 42 on various online manga platforms such as Viz Media's official website, Shonen Jump app, or through other manga reading websites. These platforms typically offer access to manga chapters for free or with a subscription.
You can read it online at MangaReader.com. I'm not sure which chapters are included in volumes 21 to 23, but the entire manga is available on MangaReader.
http://www.mangafox.com/manga/yu_gi_oh_duelist/
You can read the Kingdom Hearts manga online at Mangafox.com
you can read manga online at the website; www.onemanga.com
You can read it at mangafox.com .
You can read the manga at this website; mangahere.com
You can buy the manga from Googleplay.
Mangafox
You can read it at mangafox.com (so far they only have vol 1)
I believe it was Red Eyes Black Dragon but you would have to read the yugioh duelist series
Have you tried Manga Fox.com?