Golden Poo Snake
Place: Southern Deserted Island
It's a small island in the southern outskirts of the world. The only reason to go there is a Golden Poo Snake. This monster isn't any tough at all, and beating it grants you 30 Gamer Points.
Place: Ancient Ruins Caverns (north-east of Talta)
Reward: Autograph Paper, 2xGolden Poo
Enter Ancient Ruins Caverns and defeat Jumbo Poo. Take the Ancient Warrior's Ring, and a Corrosive Poo will appear nearby. Defeat it and try to leave the cave. King Poo appears in the center of the level. He's the single most difficult enemy in the game. Erm... Good luck?
HINT: A great item to have in order to battle all sorts of poo is Poo Bracelet. It can be found in a blue chest near entrance to Jibral town.
HINT: Visit Toripo in Aurora Ruins when possessing the Autograph Paper and he will give you his autograph. Any purpose to this? Naaah.
Gold Mecha Robo
Place: Ancient Factory
Reward: Golden Eternal Engine
This droid appears in the mail room of Ancient Factory when you possess both rare items: Final War Necklace and Ultimate Weapon Bracelet. When you see an odd-looking, golden robo, attack it. He looks harmless, but in fact plays in the same league as King Poo. Only for hardcore players.
As you see, no guide can help you defeat these two bosses - what you really need is a few hours of training. All your characters should have full sets of skills of at least 3-4 classes. Double attack, double cast, automatic resurrection - these are the basics that you can't do without. Both of the above enemies can withstand a few corporeal attacks. The good news is - it's *only* a few. If you feel self-confident about your defence, you might want to defend and wait for the Corporeals to get loaded and then use them for, like, 3000 damage each shot. The power of these two enemies doesn't lay in their HP (as with some dragons), but in speed and damage they deal.