|Grandia II Enemy|
Ignore the Bits as the Egg Guardian will revive them if they are defeated. The Egg Guardian's magic like Runner, Speedy and Diggin' are pretty useless as it won't affect the battle much, in addition, its fairly slow so you should have plenty time for Sky Dragon Slash, Fast-Dance Whirl and Beast-King Smash.
Wailing Sickle is the only attack you should watch out for because it does a fair damage to all your characters. You may want to use one character for healing but it shouldn't be necessary.