It's actually season 4. First there's Shugo chara, Second is Shugo chara doki! , Third is Shugo chara party, and finally it's Shugo chara encore. Although shugo chara encore hasn't been made into a TV series yet.
There are currently 3 seasons [Shugo Chara]-Season 1 [Shugo Chara Doki Doki]-Season 2 [Shugo Chara Party]-Season 3 [Shugo Chara Encore]-Season 4 About [Shugo Chara Encore] season 4, its gonna be out soon, for now, only the comics of it are out. :)
It's completely awesome, but Shugo Chara Party could be lame. There were only 3 episodes in Shugo Chara Party I enjoyed. However, Shugo Chara original & Shugo Chara Doki r great. I cnt wait 'till Shugo Chara Encore! i dont think theres ganna be a encore but i hope there is
Actully, there is another shugo chara anime called Shugo Chara Encore! But its not on aired on episodes its a book like a comic book but in black and white try to go to onemanga.com or Animenetwork.com to read Shugo Chara Encore!