No but evil shenron almost did in GT.
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After Goku defeats Piccolo Jr., he then goes to marry Chi-Chi but the Ox-King gets trapped in a fire again and he finds his grandpa in the otherworld, gets rid of the fire, and marries Chi-Chi.
He fights h before the Dragon Ball GT even starts.
Omega Shenron is the evil in Shenron that SSJ4Gogeta fights and almost loses.
Gohan probably learned the Kamehameha in the Hyperbolic Time Chamber from Goku, when they trained together for the Cell Games.There is a scene in the anime where Gohan performs the Masenko during the Saiyan saga, but shouts "Kamehameha", but this was an error on the part of Toei Animation.
I belive its definatly over one trillion yes it is why cause well goku vs freiza their power levels where 12 million and 15 million and yes im not going by the daziheuno its not even created by the creator of the series.Also when goku and freiaz fought that was over 30 yrs. before omega and we see how our heroes and villans improve over the yrs by then omegas power lvl is definatly over 1trillion hands down!