That's odd. Because according to other people, a +6 Fast Charge charm is possible. But they didn't say what tier is was.
That's for MHG.
Apparently there's some MHX speedruns where the person had a +6 FC charm.
The maximum value of Fast Charge is +5 and it has to be in the first skill slot.
I just tested 3 different talisman, each with FC in the first slot as +6, with varying grade levels from Queen to Dragon and non of them were valid in-game.
BTW, MHG is very confusing because it is the same name as the second MH game ever that was on the PS2.
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Alright, just tried. Didn't work. Talisman still came out blank 0/0 stats. Albeit I can view the stats in the Sort/view talisman menu...
This is weird.
I just tried creating the following talisman in both MHX and MHGen and they all worked:
Dragon Slot3 Fast Charge +5
Dragon Slot3 Fast Charge +5 Handicraft +5
Dragon Slot3 Protection + 1 Handicraft +5
Would you mind PMing me your save?