Location: Auguste Isles, "Raya's Shore, Rainbow Beach", Chapter 10, "The Saucy Mr. Crabs" There is a battle with the infamous "Lvl 45 Somnika the Delicacy". Basically, this beast of a crab will peruse its skills in a slight routine. When it deploys its 50% defense shield, it may use a single target 'Pinch' nuke of 99k in the next turn. Should its shield or charge diamond(s) be removed, there is a likely chance for its nuke skill to crop up and kill off one of your characters. The option is always open amid the risks. Even if you did not touch the shield, in two or three turns, it will deactivate to initiate the nuke. Its skills does not follow the charge diamond requirement.
How to go about this skill tripping upset crabby? One solution is to equip all earth types in the matter of weapons, weapon skills, characters, and summons. However, I don't believe that exploiting weaknesses in a normal run will defeat the crustacean. Its nuke skill is too high to cover with elemental knowledge alone. Common hearsay speaks of using nuke skills/charges, but unless you got the right character(s)/summon(s) along with proper upgrades, damage alone will not help you beat this monster.
It's quite the healthy crab so I doubt harm will be the solution. However, just be glad that its nuke skill does not cover the all or multiple targets field. For any lucky goers, if you happened to obtain any reviving characters/summons within your character roster, they will be your ultimate key to trot though this bossy ordeal. Now just survive the marathon. However, revives might not be enough as skill spamming is a constant threat. Not everybody got enough gear to outlast the rocky fight. You might want to add in status/specials to get some edge. This is for those without the right insurance. I tried charm, but this is an insect immune to the human pheromone. Paralysis seem to work wonders in holding down this crab from even moving. If you can spam paralysis for each turn, then congratulations, you showed who's the alpha crab. I am no expert on paralysis so I cannot help you there. However, I did see some slight encounters in the dodge rate working against its attacks and skills. The right dodging conditions can help here, but you have to make the design work. I am not going to say that the solutions above is readily accessible. If you just want to beat this thing regardless of setups, I hope you got a supply of full elixirs. It's going to cost you and set you back a bit. Hey, you get what you pay for, what can I say?
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I believe, but have yet test the reviving strategy against Location: Valtz Duchy, "Sarwa Desert", Chapter 5", "Rise of the Machos". This is another Grand Blues Channel challenge. I know for a fact that upgraded characters with hide skills can be the mighty ant against the charging "Lvl 38 Head Macho". Delays and healing might work too, granted that you have such gear. I'm just going to say this, his charge is definitely weaker than Somnika's or other Grand Blues bosses. His lack of normal attacks might be a blessing for those trying to beat Grand Blues battles. Also a great opportunity to heal up that 5k estimate of damage (okay, it's not something your rare characters can easily handle). Still, Head Macho is still healthy even for my maxed level characters.