I am replaying this game..US version...and I am looking for some hard bosses and valuable extra gameplay. so i have the following questions.

1. will i find some hard fun and challenging fights unlocking all of these creatures and fighting them.

2. Is it rewarding and is it worth it to proceed in this long extensive sidequest.

3. Tell me some of your personal opinions and hard to beat encouters with these creatures and tellme if you enjoyed it.

4. how strong should my characters be before attempting to fight these creatures.

5. Are these creatures or some of them more powerful than ultima and omega?