Grenade Launcher: This is awesome. Decent for edgeguarding, good for narrowing approaches down from my experience (jump and its a Nair/Fair, shield and I get a grab/Bomb Drop for good shield pressure, spotdodge and get hit at the end etc.) and quite useful for camping as well. Only thing I miss is the insta-explosion on contact with another projectile.
Flame Pillar: Mostly because I see Missiles and Stealth Burst even worse. Dont get me wrong, I like FP, but I dont use it too often. Basically another version of Fair with less range, more lag and KB. Meh.
Lunar Launch (Thats the default one right?): Gotta love that spike. Cannon Uppercut looks neat as well, but I dont like the recovery trade. The one you can angle just seems like Brawl Extremespeed to me, just even worse.
Bomp Drop: Actually my favorite custom move. Covers me well when coming from above, can be laid on platforms to create pressure, does decent shielddamage iirc, can kill later on... Love this move. Echo Reflector seems to have its uses as well, although I dont really use it that much. Vortex... naaaaah. Maybe it it had a hitbox.