What.Every Pokemon manga that isn't Special is good.
Special isn't that amazing. The only reason people like it is thus:
1) Tajiri-san says he likes it.
2) It becomes popular because he said so.
3) It keeps its popularity because 'everyone' in the fandom seems to like it.
4) It starts to go downhill and become shameless promotion like the anime, but people ignore this.
All of the manga are good. Reading Pocket Monsters makes you feel like someone spiked your morning coffee/milk/tea, but in a funny sort of way.