Here is info on the dragonballs.
For Dragon Balls on Earth:
1. Must gather all seven Dragon Balls.
2. Chant required (Come out, Shenlong, and grant my
wish!).
3. Only one wish per summoning of Shenlong.
4. After the wish is made, Shenlong will disappear, the
Dragon Balls will turn to stone and scatter themselves; they will remain stone
for one year.
5. The Shenlong cannot grant any wishes that are beyond
the powers of the creator of the Dragon Balls (The Nameks).
6. You can revive anyone or any group of people who fit a
certain criteria, if they did not die of natural causes (like age).
7. If a person has been revived by Shenlong before, the
person cannot be revived again.
For the "NEW" Dragon Balls on Earth:
*Note* After Kami-sama re-merged with Piccolo, Shenlong
became no more and the
Dragon Balls turned into stone. To revive the Dragon Balls, Goku
invited Dende from
Namek to be the new Kami-sama. Dende was able to revise
the rules and restrictions
of Shenlong's power in the revival process.
1. Must gather all seven Dragon Balls.
2. Chant required (Come out, Shenlong, and grant my
wish!).
3. Only two wishes per summoning of Shenlong.
4a. After the wishes are made, Shenlong will disappear,
the Dragon Balls will turn to stone and scatter themselves; they will remain
stone for one year.
4b. If only one wish is made during the summon and the
Dragon Balls turn to stone, they will remain stone for four months, and
then Shenlong may be summoned again.
5. The Shenlong cannot grant any wishes that are beyond
the powers of the creator of the Dragon Balls.
6. You can revive anyone or any group of people who fit a
certain criteria, if they did not die of natural causes.
7. If a person has been revived by Shenlong before, the
person cannot be revived again.
For Dragon Balls on Namek:
1. Must gather all seven Dragon Balls.
2. Chant required in the Namek language.
3. Wishes must be said in the Namek language.
4. Only three wishes per summoning of Puronga (Eternal
Dragon of Namek).
5. After the wishes are made, Puronga will disappear, the
Dragon Balls 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 Dragon Balls.
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.
*NOTE*: Dragon Balls of Namek are more powerful and much
bigger than the ones on Earth
For Black Star Dragon Balls:
1. These Dragon Balls are spread throughout the universe and are much harder to find.