Quote Originally Posted by Tavrobel
The original Jecht Shot is earned on the boat that takes you to Luca, which is always availble to ride on.
If you've already reached Luca you'll have to wait until you finish Djose Temple before you can return.

JS2 is a first place Tournament prize. As has already been said, you need to learn Tidus' Key Techs (Venom Tackle, Drain Tackle 2 and Anti-Venom 2). He also needs to be Lv16 or higher.