it's the most iconic technic of all dragon balls series (after the kamehameha). It used only by goku who learn it from kaio-sama. At the beginnig it was suposed to kill anyone (it was the ultimate weapon) but it failed against the first fucking ennemy, VEGETA ! and against freeza, and in many films and DBS against Jiren. In fact it only killed buu, that was a huge impact showing the solidarity with the others how finally took responsabilities by giving their genki (because in all the series, only the nature helps). So at the end, its an useless technic unless against final bosses (dragon ball gt and super werent planned but he uses it against li shenron)
goku: give me genki !
a normal human : wtf is he saying
goku: just raise your hands !
a normal human: no you will kill me for sur like those monsters
goku: it's for the genkidama! to save you and the planet
a normal human: no.
a db fan: genkidama ? take all my power goku ! let's save the world!
goku: taste it Jiren ! GENKIDAMAAAA !!!!!!!
a normal human : wtf is he saying
goku: just raise your hands !
a normal human: no you will kill me for sur like those monsters
goku: it's for the genkidama! to save you and the planet
a normal human: no.
a db fan: genkidama ? take all my power goku ! let's save the world!
goku: taste it Jiren ! GENKIDAMAAAA !!!!!!!
by A true dragonball fan(even gt) January 30, 2018