In "Dragon Quest 3: HD-2D Remastered Edition", players can get a total of two magic balls. If you want to get the second magic ball, you can meet Luo in the prison next to Tantegel Church. Bin Od, and he will send you to his men.
How to get another magic ball in Dragon Quest 3 Remake
When you meet Robin Odd in the prison next to Tantegel Church, he will tell you to find his men, saying that they are happy to meet a familiar figure in Alef Garudo face. So, go visit them, they are in the caves under construction south of Cole.
They will mention some special stone they want to get from the belly button of the earth, but they will need a very big bomb to get it. That's it, no other prompts. So where exactly did you get this bomb? By visiting another familiar face, of course.
If you find the blue stone in the belly button of the Earth, it will give you some clearer hints on where to find the bomb.
At the beginning of the game, you had to go to Reeve to get a magic ball from an old man to open the way to the Promise Road. Visit him again and ask him to give you another bomb. He will coincidentally tell you that he just made another one and gave it to you.