At the beginning of the battle it will cast Power Spritz to give itself various status enhancements. Dagonite often uses Rush to launch a target up into the air. When it uses Water, the target will slow down and become dazed. Although not an overly difficult enemy, the party can employ Lightning-elemental attacks to deal maximum damage. By using its Rush attacks, they can interrupt character actions, stopping a finishing blow or a frantic Cure spell to a fellow party member.
Dagonites should be disposed of first. They have dizzying attack combos, so a Sentinel will help.
Dagon was a major Semitic god, supposedly of fish or fishing.