If this is the same Project Manga that I'm thinking of, its a sector of Bulbapedia which creates and edits articles on Pokemon Manga.
I was wondering if the Project Manga can make a new arc of Pokemon Adventures based of a popular Rom Hack (ex. Pokemon Glazed or Pokemon LoG series).I know these ROM Hacks are just fan made but these hacks are greater than the original ones.And I want to hear feedbacks to everyone here.(SORRY For my bad english)
As Dero said its still unclear what you're asking. You're wanting the manga Pokemon Adventures/ Pokemon Special to have a new arc based on on a Pokemon hack? Unfortunately it is not Project Manga who writes PokeSpec. It's authored by Hidenori Kusaka and Illustrated by Mato/ Satoshi Yamamoto. Have no idea how much the non-western world is into ROM hacks and either way it isn't so simple as agreeing it to be part of the series - that is if you're looking for a ROM hack stories to be serialised and published like the regular series is.
However, a suggestion could be to start a group to create a team of people to make a fan comic. Not sure how many artists would like to partake in a long project, but you could go and ask around the Art and Design forum to see if someone has a similar vision to you and would like to team up to make such a vision a reality.
Good Luck.