Umbreon, you can get every ribbon except the National Ribbon, as it is impossible to get a shadow Umbreon on either XD or Colosseum. You can get a shiny Eevee in XD, but it is a non-shadow. Every other ribbon is available on shiny Umbreon (as well as the other shiny Eeveelutions) so long as the Eevee is received/caught/bred in any Gen 3 game. More @Wikipedia
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