All codes below are hacked by me.
10 Bubbles
82002F74 000A
Star Modifier
82002F78 00xx
Replace xx with the value of stars that you want (must be in hex).
Here are some basics if you don't know hex:
10 stars = 0A
255 stars = FF
100 stars = 64
Level Modifier
02002F58 000X
Replace x with one of the digits below:
0 - First Day
1 - Drop off
2 - Meeting Dory
3 - Minefield
4 - Aquarium
5 - Abyss
6 - Training
7 - Jelly Fish Forest
8 - Filter Block
9 - Turtle Drive
a - Treatment Plant
b - Finding Father