After you can summon Shenron, you can ask him for one of the following wishes.

Wish	Effect
I want a new Super Attack!	Flash Bomber, Drain Field, Lightning Ruin and Air Consumption Super Attacks (first time) or the Castrol Lightning Dragon Bullets, God Speed Light Bullets, Whirlwind Spin, and the Sleepy Boy Box Super Attacks (second time)
I want a new Ultimate Attack!	Blitz Hell Ultimate Attack (first time) or the Minus Energy Ball Ultimate Attack (second time)
I want a rare item!	Power Pole accessory.
I want a second chance at life!	Reset skill points to re-assign them to different categories.
I want money!	500,000 Zeni.
I want more useable characters!	Super Saiyan 4 Gojeta (first time), Super Android 17 (second time); and Omega Shenron (third time)
I want to be drop dead gorgeous!	Change the look of your created character.
I want to dress up!	One item from the Journey to the West outfit set.
I want to get stronger!	Items to Craft Z-Souls.
I want to grow!	Increase your character's level by one.