You can't get it in leafgreen.
The Lunar Ribbon does not evolve any Pokémon.
Some missions can give a reward. It can be a lunar ribbon.
try to go to youtub. if not go to gamefaqs.
The lunar ribbon can be used at nighttime instead of levelling up a Pokemon. It will be stored in your bag until you need it and then you must equip it.
find it in a dungeon
You need a Razor Fang and a Lunar Ribbon.
T97N3 6JX+P%- W1MN9 1K-NJ 6C696=# F7MH3 Object: Guide Nidoran to Beach Cave 2F Reward:Cash + Lunar Ribbon I have tried it myself, and it is guaranteed to work.
try using wonder mail codes
The Lunar Ribbon is an item used to evolve Eevee into Umbreon and Chingling into Chimeco. To do so, you must graduate from the guild and unlock Luminous Spring. Place the Lunar Ribbon in your Treasure Bag and feed Gummis to the Pokemon you want to evolve until it reaches four full stars of IQ. Then go to Luminous Spring [the Pokemon does not need to be in your party]. Select its name from the list of Pokemon available to evolve and select the item you want to use to evolve it. If the Pokemon is part of your team, the team will be disbanded, so be cautious.
It is the object that works as "the night" in Pokemon mystery dungeon 1 and 2. It evolves: Gligar-Gliscor: with razor fang too. Sneasel-Weavile: with razor claw too. Eevee-Umbreon: with 4 stars of IQ. And maybe other Pokemon evolve too, good luck!!
To obtain a Lunar Ribbon in Pokemon Mystery Dungeon: Explorers of Time/Darkness/Sky, you must first recruit Uxie, Mesprit, and Azelf. Then, go to Spacial Rift or Temporal Tower to complete a mission given by Celebi. After completing the mission, you will receive the Lunar Ribbon as a reward.
Lunar Ribbons can be found by Pokemon missions, dungeons, boxes, and Kecleon shops. The Kecleon Brothers don't sell Lunar Ribbons, so they have to be found in shops in dungeons. ~Hope This Helps