are you talking about yugioh gx spirit caller? if so then you have to duel professor sartyr a certain amount of times, it can range from 1-100 even more
hope this helps :P
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You can't transfer to Ra yellow or Obelisk blue you just can be a Slifer Red
The answer to that is to have a higher score than Jaden or have a higher score than someone in Ra Yellow if you have already been to Ra Yellow. Same with the advancement to Obelisk Blue. If Bastion is higher than any of the O. Blue dolts, you only have to have a higher test score than one of the dolts.
You can get it online on EBay
you cannot use ra in a yugioh duel because the back is not similar to the cards. the ra card is yellow and its totally different from the anime series. Ra's card has no rules text, and has 'This card cannot be used in a duel' in either English or Japanese, depending on which print it is.
By beating Professor Satyr 49 times. Enjoy dueling him I sure didnt.