1. Where do you get the break black containers level-up for Sonic in the..

1. There is no break black container power-up.

2. here are the locations to all of the chao animals
1. the bunny, blue racoon, pony, sheep, and skunk can be found in city escape.
2. the hog and cheeta can be found on radical highway.
3. the bear, gorilla, and parrot can be found in the egg qaurters.
4. the dead cow, bat, sea monster, and the tiger can be found on pumpkin hill.
5. the penguin, seal, peacock, and the yellow bird can be found on metal harbor.
6. the purple bird and the dragon can be found on wild canyon.
7. then finally the sea otter can be found in the oasis.

3. no you do not need all 21 animals to make a sonic chao, you just keep giving it green chaos drives and make it a dark chao.

Yes there is a power-up to break those black containers. Get the flame ring. Just look through the questions or check a FAQ. You will see it.