Pokemon eligible for max ribbons. An arrow next to the Pokemon's name means they are capable of evolving, so their evolution is capable for max ribbons as well. Only Shadow Pokemon in Colosseum are capable of being shiny, Shadow Pokemon are shiny locked in XD.

--Pokémon Colosseum--
Makuhita -> Hariyama
Bayleef -> Meganium
Quilava -> Typhlosion
Croconaw -> Feraligatr
Slugma -> Magcargo
Noctowl
Flaaffy -> Ampharos
Skiploom -> Jumpluff
Quagsire
Misdreavus -> Mismagius
Furret
Yanma -> Yanmega
Remoraid -> Octillery
Mantine
Qwilfish
Meditite -> Medicham
Dunsparce
Swablu -> Altaria
Sudowoodo
Hitmontop
Entei
Ledian
Suicune
Gligar -> Gliscor
Stantler
Piloswine -> Mamoswine
Sneasel -> Weavile
Aipom -> Ambipom
Murkrow -> Honchkrow
Forretress
Ariados
Granbull
Viabrava -> Flygon
Raikou
Sunflora
Delibird
Heracross
Skarmory
Miltank
Absol
Houndoom
Tropius
Metagross
Smeargle
Ursaring
Shuckle
Togetic - Togekiss

--Colosseum E-Reader--
These shadow Pokemon are available in Colosseum, but you need access to the e-reader room, and the e-reader cards. All three of the e-reader Shadow Pokemon are also available in Pokemon XD (if you evolve Shadow Scyther).

Togepi -> Togetic -> Togekiss
Mareep -> Flaaffy -> Ampharos
Scizor

-Pokémon XD--
Teddiursa - Ursaring
Ledyba - Ledian
Poochyena -> Mightyena
Baltoy -> Claydol
Mareep -> Flaaffy -> Ampharos
Seedot -> Shiftry
Spheal -> Sealeo -> Walrein
Gulpin -> Swalot
Spinarak -> Ariados
Numel -> Camerupt
Carvanha -> Sharpedo
Shroomish -> Breloom
Delcatty
Voltorb -> Electrode
Makuhita -> Hariyama
Vulpix -> Ninetales
Duskull -> Dusclops -> Dusknoir
Ralts -> Kirlia -> Gardevoir or Gallade (if Male)
Mawile
Snorunt -> Glalie or Froslass (if Female)
Pineco -> Forretress
Natu -> Xatu
Roselia -> Roserade
Meowth -> Persian
Swinub - Piloswine -> Mamoswine
Spearow -> Fearow
Grimer -> Muk
Seel -> Dewgong
Lunatone
Togepi -> Togetic -> Togekiss
Nosepass -> Probopass
Zangoose
Paras - Parasect
Growlithe -> Arcanine
Shellder -> Cloyster
Beedrill
Pidgeotto -> Pidgeot
Tangela -> Tangrowth
Butterfree
Magneton -> Magnezone
Venomoth
Weepinbell -> Victreebel
Arbok
Primeape
Hypno
Golduck
Sableye
Dodrio
Raticate
Farfetch'd
Altaria
Kangaskhan
Banette
Magmar -> Magmortar
Pinsit
Rapidash
Magcargo
Hitmonchan
Hitmonlee
Lickitung -> Lickilicky
Scyther -> Scizor
Chansey -> Blissey
Solrock
Starmie
Swellow
Electabuzz -> Electivire
Snorlax
Poliwrath
Mr. Mime
Dugtrio
Magnectric
Salamence
Marowak
Lapras
Rhydon -> Rhyperior
Moltres
Exeggutor
Tauros
Articuno
Zapdos

--Event--
Metang -> Metagross