how do you get cuchulainn

Okay, did you already complete the "Waterway Haunting" and "Lost of the Pudding" hunt? Those are required to find the Esper with the Sluice Gate Key. Use the key to activate the waterway controls in a certain order, which will lead you to the Esper.

This is the order:

Close the No. 3 and No. 10 controls in the Central Waterway Control. Go in the No. 3 Cloaca Spur and use the No. 1 South Waterway Control at the end. Go back to the Central Waterway Control and open the No. 3 and No. 10. Close No. 4 and No. 11 then go through the No. 4 Cloaca Spur and use the No. 1 North Waterway Control.

Now, go back to the Central Waterway Control again and open No. 11 and No. 3. Then go to the No. 1 Cloaca Spur and you'll find Cuchulainn at the low point on the south end. There should be a save point, so don't forget that. ;)
 
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