Eldiw · shrine
Lunar Tunnel
Lunar Tunnel is a Dielebi Shrine location, found on an island at the furthest right (east) end of Route 16. With Dielebi in the party, the player can trigger the shrine to travel to an alternate dimension containing a retro Cresselia.
How to Reach It
On an island at the far east end of Route 16.
Story Relevance
One of several Dielebi Shrine sites; requires the Legendary Pokémon Dielebi in the party to access the Cresselia encounter.
Source: pokemon-xenoverse.fandom.com (Lunar Tunnel and Dielebi Shrines articles, raw wikitext); Lunar Tunnel's own page is marked "Temp Page," high confidence on the core facts (corroborated by the separate Dielebi Shrines mechanic article).