Here's why:
* Licensing: Licensing rights for anime dubbing are complex. The rights to dub a show might be held by a different company than the one who holds the rights for the original Japanese version.
* Popularity: While Shugo Chara has a dedicated fanbase, it may not be considered commercially viable enough for a dub by major studios.
* Time: The show aired from 2007 to 2010, and the popularity of anime shifts constantly. It's possible that interest in a dub might have dwindled since the show's original run.
However, there are still some possibilities:
* Fan-made dubs: There are several fan-made English dubs available online, though their quality varies.
* Streaming services: A streaming service might choose to invest in a dub if they believe it would attract a large audience.
Ultimately, only time will tell if an official English dub of Shugo Chara is ever released.