does 悟空 ssj4 have a dragon fist like 悟空 ssj3?

yes in gt when he tries to defeat omega shenron he says is my ultimate tehnique but its now working then fusion with vegeta

well in the game boudokai tenkaichi game they did ssj4 dragon fist as his ultimate so yes

he did a 10x kamehameha dragon fist combo to omega shenron IIRC