You can acquire these most reliably through Bribe, but some enemies drop them
as rare items, and some can be bought. In the same order as the preceding
question, these are the ones I know of:
- Fortune Sphere: found in various locales, dropped by Earth Eater
- Attribute Sphere: bribed from Maelspike
- Special Sphere: bribed from Adamantoise
- Skill Sphere: bribed from Zuu
- White Magic Sphere: bribed from Dark Flan
- Black Magic Sphere: dropped by Seymour, dropped by Evrae, dropped by Evrae
Oltana, bribed from Black Element
- Level 1 Key Sphere: found in various locales, dropped by Chocobo Eater,
dropped by Sand Worm, dropped by Master Coeurl, dropped by Puroboros,
stolen from Earth Eater, bribed from Imp
- Level 2 Key Sphere: found in various locales, dropped by Spherimorph,
dropped by Seymour Natus, dropped by Defender X, dropped by Tonberry,
dropped by Defender Z, dropped by Varuna, stolen from Catastrophe, bribed
from Behemoth
- Level 3 Key Sphere: found in various locales, dropped by Defender Z,
dropped by Yunalesca, dropped by Sin's right fin, dropped by Sin on the
airship, dropped by Behemoth King, dropped by Seymour Omnis, dropped by
Demonolith, dropped by Machea, dropped by Ultima Weapon, stolen from
Ultima Buster, stolen from Biran Ronso, stolen from Yenke Ronso, bribed
from Demonolith
- Level 4 Key Sphere: found in various locales, dropped by Seymour Flux,
dropped by Spectral Keeper, dropped by Land Worm, dropped by Omega Weapon,
stolen from Nemesis, bribed from Chimera Brain
- HP Sphere: dropped by Lost Ochu, dropped by Sin's left fin, dropped by
Ironclad
- MP Sphere: dropped by Lost Ochu, dropped by Sin's Core, dropped by
Vidatu
- Strength Sphere: found in various locales, dropped by Juggernaut
- Defense Sphere: found in various locales, dropped by Tanket
- Magic Sphere: found in various locales, dropped by Jumbo Flan
- Magic Defense Sphere: found in various locales, dropped by One-Eye
- Agility Sphere: found in various locales, dropped by Fenrir
- Evasion Sphere: found in various locales, dropped by Pteryx
- Accuracy Sphere: found in various locales, dropped by Hornet
- Luck Sphere: found in various locales, dropped by Greater Sphere
- Clear Sphere: bought from the trainer at the Monster Arena after capturing
at least five of every monster (ie; when Ultima Buster is unlocked)
- Return Sphere: won from Blitzball games, dropped by Biran Ronso, dropped by
Yenke Ronso, dropped by Sanctuary Keeper, dropped by Sinspawn: Genais,
dropped by Barbatos, dropped by Black Element, dropped by Chimerageist,
stolen from Greater Sphere, bribed from Dark Element, bribed from
Mandragora
- Friend Sphere: dropped by Biran Ronso, dropped by Yenke Ronso, dropped by
Spirit, dropped by Master Coeurl, dropped by Vorban, stolen from Neslug,
bribed from Coeurl
- Teleport Sphere: dropped by Master Tonberry, dropped by Sleep Sprout,
stolen from Th'uban, bribed from Barbatos
- Warp Sphere: found in the Omega Ruins if you open all of the treasure
chests there in the correct randomly-generated order, bribed from Master
Coeurl, stolen from Nemesis
That didn't come out good... no? Try
http://www.saunalahti.fi/lvirkkun/maxstat.txt for more help...