Planetary Rendezvous

"Planetary Rendezvous" is a 4-star Light Cone for characters following the Harmony Path, which performs quite well and comes highly recommended, especially if your goal is to boost the damage of characters sharing the same element as the wearer of the Light Cone.

The only drawback I see is that it is a Light Cone that will only serve us in certain situations, and generally, we would prefer a cone that is effective in all situations. However, that doesn't take away from the fact that in the ideal situation, it is an incredibly efficient Light Cone.

You can really equip it to any character following the path, as long as they are supporting DPS characters of the same element. Still, since some characters already have mechanics or abilities to enhance characters of their element (Sparkle or Asta would be good examples), it would be better to equip it to these types of characters.