wheres my halloween quest!?

[Lee-yoshi]

Do you mean is it faster to get a MAG cell though this quest then normal? I couldn't tell you. Since it's Hallowe'en, technically, you should be able to get the following MAG cells for the while the quest is available, on Episode IV at least:

• MAG Cells 502
  
• MAG Cells 213
  
• MAG Parts of RoboChao
  
• MAG Heart of Opa Opa
  
• MAG Heart of the Angel
  
• MAG Chao Heart
  
• MAG Heart of Chu
  
• MAG Heart of Kapu

At least you can in the Japanese version of the Episode IV Expansion Pack, so i can't see why you wouldn't be able to get them now in the English version... (Click Here for the MAG & Episode IV Items list)