
Defending Rillia - Claria Party: Claria, Daryl, Deuterium and Maryliys
My equipments were:
Spoiler: show
Use Claria to heal when needed, if a character die and she's alive. Use Rebirth to revive the others, don't waste revival itens, only use when she dies. Either attack or defend with Daryl. Marillyis The 7 Seas spell can't
instant kill some enemies, so it's advised to use. Deuterium Multi-Laser can easily kill dragons and strong enemies, so fire at will.

Defending Adretana Mirsen district - Joshua party: Joshua, Herasia, Rosa and Angelina
My equipments were
Spoiler: show
Joshua Magicka Bomb is very strong spell, Ante-Psalm is a very useful spell too, and also Joshua have Heal and Revive, use those instead of using items. Herasia Big Lethal Claws are very powerfull and can hit lot of enemies, Rosa Ocean Tornado is powerfull against some weak enemies and also help kill strong enemies. Angelina Super-Shot (if she's equiped with the rocket launcher) is not so strong, but hit all enemies.
Defending Adretana Port - Herbert Party: Herbert, Guanidia, Burssian and Adon.
My equipment were:
Spoiler: show
Ketakeri Blade is very powerfull, so with Herbert just attack. Brussian Lehtal Move is very good and can hit three enemies if you're lucky, and depending of the weapon you're using it can cause Bleeding. Guanidia Phagocytose is essential, it can kill weak enemies and cause a lot of bad conditions in the enemies. Adon Armor Crush is strong too.
Defending the entrance of Adretana Castle - Djarma party: Djarma, Fierce, Cocka-Cocka and Kratin
My equipments were:
Spoiler: show
Here you got to be careful with the Neons, I used with Djarma Ultai Saber and Sun Dazzler, when you use Sun Dazzler, Kratin can make another move aswell, which is great if you're using the North-Star like me. Heal with Djarma when needed, Kratin use Double Hit which is a powerfull move with the North-Star. Attacks with Cocka-Cocka and Cerberus Craze with Fierce. To kill dragons, use Double Hit with Kratin and Sun Dazzler with Djarma, like that Kratin can attack again, it may take a little while, but he goes down.
Defending inside the Adretana Palace - Alexander Party: Alexander, Kenny, Timbany (Gorilla Form),Broff
My equipments were:
Spoiler: show
This part is easy, Alexander spell ''Days of Punishiment'' is very useful because it can instant kill enemies, so use a lot. Broff just attack and try to cause Ground Lock in the enemies, Timbany(Gorilla) normal attacks are very powerfull, so with him attack aswell. Use Kenny to heal and defend, she's weak (at least she was with me) so Heal, defend and revive when needed with her.
Defending the gates of Adretana - Coryool Party: Coryool, Marion (I used her because the others were weak), Nash and Askhbar
My equipments were
Spoiler: show
This is the hardest part, but with Nash is easy XD. When facing a lot of enemies, use Coryool Bomber YYZ, when less enemies, attack with him. His attack are powerfull. With Nash use Thunder Sky, is a powerfull spell, if the Thunder Sky doesn't deal too much damage, use Fire Ball. When needed use Heal with him, good and won't cost MP, better than use items. Attack with Askhbar and with Marion use only boost spells and defend.

Finished, it worked for me. Hope it worked to who see this.
