Legend has it that there are seven dragon balls scattered all over the world, each with one to seven pentagram marks. When you collect all seven dragon balls and recite the spell, you can summon the dragon and make a wish to it. After the dragon realizes its wish, the seven dragon balls will fly away automatically and become stones, which can be used again one year later.
The final result:
At the end of Dragon Ball GT, after the dragon was destroyed, the dragon suddenly appeared without being summoned (the sky was not dark at this time), and told people that the dragon ball could not be used by them any more, and he would never appear again.
Then the dragon said to the Monkey King, "Wukong, come up." The Monkey King replied, "Ah, is it time already?" Then the Monkey King rode away on a dragonfly and merged with the seven dragon balls. No one has seen the Monkey King and Dragon since then.