How do you get hero and dark chao garden in sa2b

to get the dark garden evolve a child chao into a dark chao do the same with a hero chao

Also, to get the type of chao, pet it with a hero character or a dark character of your choice (It does not matter which character you choose).

If you want the hero garden, you must pet the chao with a hero character. It should be turning all white with blue on the hands and feet with a yellow stomach. Wait until your chao evolves. It should turn into a hero chao then Boom! you've unlocked the beloved hero garden.

If you want the dark garden, you must pet the chao with a dark character. It should be turning black with red on the hands and feet. Wait until your chao evolves. It should turn into a dark chao then Boom! you've unlocked the dark garden.