Dragon
Monster Rancher Metropolis: Monster Rancher 1 Archive (PSOne): CD List: Dragon
After years of research, we have proof that only the rare types (/??? sub-breed) can be gotten off CD for any Monster Rancher 1 main breed (except Doodle) which has to be unlocked through in-game play. This means the Ape, Dragon, Ghost, Henger, Magic, and Nya types can only be found as the /??? on CD, the other forms are available through combining. This means that the following Dragon types are not available on CD:

171 Jihad [Dragon/Golem]
172 Gariel [Dragon/Gali]
173 Laguna [Dragon/Monol]
174 Dragon [Dragon/Dragon]
175 Robo [Dragon/Henger]