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Let's say everyone has 10 weapons with similar stats, the Ultimate Weapons are the 11th.
So the Laughing Gema, V-000/BL and Royal Toy Set may be their respective characters "best" weapons, but I don't think they fall under a "Ultimate Weapon" simply because they are too weak.
I think their best weapons are simply bought in the shop normally by a high price like everyone else best shop weapon, so both of these girls will be forever weaker then everyone else.
As you can see, the weapons are only available for optional characters, and the CPU Candidates are the only fixed ones to get one too.