Sun Ribbon

The Sun Ribbon is an evolutionary item in Pokémon Mystery Dungeon and its sequel, which can evolve Eevee into Espeon, Roselia into Roserade and Riolu into Lucario in Pokémon Mystery Dungeon 2.

In Pokémon Mystery Dungeon, it is found in 20th floor of Wyvern Hill under a corridor which requires a key.

Eevee, Roselia or Riolu will not be able to evolve into Espeon, Roserade, or Lucario unless they have four stars of IQ, even with the Sun Ribbon.

Pokémon Mystery Dungeon series items Consumables: Food • Gummis • Seeds • Berries • Health drinks Held items: Glasses • Scarves • Recruitment-affecting items Miracle and Wonder Chests • Seven Treasures Space Globe • IQ Booster • Flags • Looplets Objects: Wonder Orbs • Throwing items • HMs • Used TMs • TMs • Keys Link Box • Gabite Scale • Gracidea • Friend Gifts • Devices Emeras • Progress Devices • Wands • Djinn's Bottle Special: Rescue Team Starter Set • Toolbox • Exploration Team Kit Treasure Bag • Treasure Collection • Mystery Dungeon evolutionary items Teleport Gem • Colored Wings • Wishing Stone • Music Box • Vortex Stone Treasure Boxes • Mystery Part • Secret Slab • Exclusive items Relic Fragment • Wonder Egg • Lost Loot • Sky Gift Lookalike Items • Prize Tickets • Gates to Infinity exclusive items Manuals • Entercards • Lucha Token • Connection Orb

Here is a wonder mail for Mystery Dungeon 2 to get a sun ribbon:

K+74 X3@0 3&H5

6%XK T18N 8466

You need to go to the dark crater's B14F and find a gold thorn with smeargle.