Here you will find some info on the Dragonballs

 

Earth Dragonballs

1 The person/people must gather all seven DragonBalls.

2 A chant is required (Such as "Come out, Shenlong, and grant my wish!").

3 Only one wish per summoning of Shenlong.

4 After the wish is made, Shenlong will disappear and the DragonBalls will turn to stone and scatter themselves; they will remain stone for one year.

5 The Shenlon cannot grant any wishes that are beyond the powers of the creator of the DragonBalls.

6 You can revive anyone or any group of people who fit a certain requirements, if they did not die of natural causes.

7 If a person has been revived by Shenlong before, the person cannot be revived again.

 

Namek Dragonballs

1 The person/people must gather all seven DragonBalls.

2 A chant is required in the Namek language.

3 Wishes must be said in the Namek language.

4 There are 3 wishes per summoning of Puronga unlike the one of the Earth balls.

5 After the 3 wishes are made, Puronga will disappear and the DragonBalls will turn to stone and scatter themselves; they will remain stone for 130 days.

6 Puronga cannot grant any wishes that are beyond the powers of the creator of the DragonBalls.

7 You can revive anyone multiple times, as long as he/she did not die of natural causes.

8 You can only revive one person per wish.