Quote Originally Posted by Jowy View Post
The only opportunity to capture a Hydra is during the Nelveska battle.
No, you can get them in the Deep Dungeon as well...actually, that's the best place to go to add monsters, you can easily invite a behemoth, dragon, and Hydra all in the same battle. (although its probably best to do one at a time)

Then breed...and poach. repeat.