Holocrons??

In witch novels did luke find the holocrons (or is there only one he has?)

 

Dark Empire comic series I believe

 

Didn't he find one in COPL? Or was that just Data in the Chu'unthor?

 

Technically Luke didn't find that one, Leia stole it from Palpatine.

 

Yeah, Leia stole the Bobo Baas holocron in DE. It was destroyed in Champions of the Force.

Other Holocrons Luke and his order have acquired are that of Asli Krimsan, found in Vader's Fortress and the of Arca Jeth found by Tionne on Arkania in EGtA.

There are also a few other options, such as the Sith Holocron Mara recaptured from Kaerobani in MOTS.

Have a look here for more information.

 

Well, IIRC, its never really stated that the Mysteries of the Sith Holocron was a Sith one. That's just conjecture from its pyramidal appearance. However, I seem to remember that once you have it in your inventory, it looks like a cube Holocron.

Luke also had a red pyramidal holocron in Yoda Stories, but he gave it away.

It is also possible that the "Force-power cubes" in Jedi Outcast and Jedi Academy are small holocrons.