Quote Originally Posted by kain_ex View Post
But I think you're talking about how to Get POWER Spheres and the kind in the 2nd answer. I want STRENGHT spheres (the ones that turns an empty node into something new). I'm lacking them. If you informed correctly, then sorry but I'm still not too good in the game. BTW, I've completed the game already... but I'm doing sidequests and things like it now.
Yeah, all of your stat raising spheres can be obtained in the monster arena from the species creations, except Fortune and Luck spheres, which are found under original creations. You'll need to do a lot of capturing, though, before you'll need to worry about stockpiling stat spheres.

Species Creations:

Fenrir: agility sphere
Vidatu: MP sphere
One-Eye: Mag. Def.
Jumbo Flan: magic
Tanket: defense
Juggernaut: strength
Ironclad: HP

Original

Earth Eater: fortune
Greater Sphere: luck

Also, you'll want to do some leveling, weapon and armor gathering/customizing, etc. before you take on the creations.
I don't have PAL version, so I can't tell you anything about dark aeons.