Is it the Enemy Skill materia you pick up in the Beginners hall in Junon?

Maybe an experiment - You can 'experiment' with the materia

Maybe helping newbies - It's in a beginners hall, which certainly would help newbies

Maybe with the Forgotten - The Junon hall has the forgotten souls of the people who were in the Sector 7 hall

Maybe with the forgetful - This might be something to do Cloud and his Memories?

It's a bit of wild guess, but there you go.