LoLo and MoMo are a couple of fairies found in Yggdrasil as an Event Item. They were hiding from the Cefiro.
How to Get: Go into Look Mode in the second room of Stage 6's first area, then move ahead to the third room. Use one Trigger Point to inspect the grass to find them.
Function: Once reunited with their friend, LaLa, they will attempt to leave. The player can convince them to come along and fight, rewarding you with Battle Pixies x03.