Hello, During my school trip to Munich I have spot a Mercedes SL65 AMG with the black series body kit. The point is: It have an ''SL95 AMG'' badge, I've never heard of it, could be a special version?? I am sure that it wasn't a fake...

no idea, never heard of an SL95

maybe he stuck the 6 on upside down

The owner just probably screwed around with the markings to make it 'cooler' (not)

I'm quoting Yeng (YL07) here:
"There is not [sic] such thing as a SL95. I'm 100% sure the owner just flipped the 6 upside down. AMG mostly uses the 63 & 65 designation on current AMGs, the exceptions to this is are the 2013 A45 AMG & 2014 CLA45 AMG. The next most common is the 55 AMG designation.

Since there are a lot of AMGs, I'll mainly focus on the SL-class AMG names. Besides the SL55, SL63, & SL65 AMGs, there have been others. The first SL-class AMGs were offered during the 4th gen. SL-class R129. AMG offerd 4 verisons(ogranized by rarity); The SL60 AMG(the most common of the 4), then the SL70 AMG (150 built), next is the SL73 (only 85 built), and last & rarest one of them all is the SL55 AMG (only 65 built).

As you can see, the SL73 AMG is the highest designation ever given to any AMG."