You can unlock Bomb King by capturing give of each Bomb-type fiend, which includes each of the following:
HP: 480,000
Bomb King is similar to other Bomb-type enemies in that it will grow three times and will begin attacking with more powerful attacks as it grows, but it will not “Self Destruct” to hit your party members. Once it is fully grown, it will use 
Ultima as its regular attack, which will do quite a bit of damage to your team.
You should consider power leveling your characters and obtaining the Celestial Weapons. Check out the Advanced section of the Tips and Tricks for more information. With properly leveled characters, this fight is pretty straightforward.
| Ability | Description |
|---|---|
 Sensor |
“Immune to sensors.” |
 Scan |
“Immune to scans.” |
Steal:
Fire Gem (x4) (common)
Shining Gem (rare)
Drops:
Door to Tomorrow (common)
Dark Matter (rare)