Salamencetrainer34, I'm not sure where you heard that. I've found at least 10 Gold Mystery Data, and they usually contain SP Navi chips, really rare standard chips, or 10000Z.
I have never acquired a Django, DoubleBeast, or the like from it.
Salamencetrainer34, I got tired of it reeeeeeeeeal fast.
BN6 is also the only game that KEEPS that music playing even after the final boss is cleared, which is very annoying. (No other BN or SF game does that; it stops playing in the overworld when the boss is cleared.)