Donald and Goofy are found in the Third District after the fight against Leon. To fight against Leon, return to Cid's shop then leave. It doesn't matter if you win or loose against Leon.
Then a cutscene will happen, and after the cutscene, Leon will tell you to 'Find the boss of the heartless'. Head over to the third district, and you'll meet Donald and Goofy.
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Return to Traverse Town. You will need to occasionally revisit Cid so that he can improve your Gummi Ship.
In the 1st place in Traverce town walk around the shop until you find it it has a green door
just go down back to where the gates are and go into the door where you fought Riky, and there you should find Kairi, Donald, and Goofy
Alice is not in that world any more her in in hollow bastion. calyton just disappear from the game the shadow are now difficalt to defeat and. you can't go back to traverse town untal the that story is done.
If you go to Hippo Lagoon go up the vines and swing on the vines there. Soon you'll find them, but it's easy to get lost, so be very careful.