I couldn't finish 'em. Looks like this's gonna get complicated.
King Sahagin is an enemy in Crisis Core -Final Fantasy VII-.
It is agile, and uses Jump frequently. The player should dodge its attacks and use abilities such as Tri-Thundaga, Electrocute, Energy, or most preferably, Costly Punch to deal with them quickly before they can grant themselves or allies the Null Physical and Null Magic statuses.
Jumping just after the enemy works. It takes longer to defeat them this way, but Zack takes less damage.
Sahuagin (often misspelled or transliterated "sahagin") are fishlike, monstrous humanoids that appear in the Dungeons & Dragons role-playing game.