Hint: Capture rare monsters:
If you have an Ovaseed, just throw it at the monster you want to catch. This is useful when catching Souvenirs and Guardians.

Hint: Get a Kid egg:
Find all three bells by defeating three special Souvenirs. After you give them all to the old man, go on a quest and return. Go find the old man and he will give you a Kid egg.

Hint: Getting "The Dragon Kings":
Get a Kid to the Dragon stage or catch a Dragon in the basement floors. Then, catch a Bomber and evolve it into a Daedalus (they turn into the upper forms at level 10). Fuse them together to get Blith. Next, get a Daedalus and Vevil (Vevils are found around the 90th basement floor). Fuse them to get Yankash. The other Dragon King is obtained by the same process, but use a Glacier to fuse with the Daedalus or Vevil.