Yes there is.
Whoever answered this answered WRONG there is no chao garden in Sonic Unleashed just a mission on the 360 and the ps3 version where you must rescue chao in Spagonia ~ Yourstrulyman88
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Sonic Advance 1, 2 and 3 (Gameboy Advance) have chao gardens which are small and not very great, but Sonic Adventure (Dreamcast), Sonic Adventure DX (GameCube), Sonic Adventure 2 (Dreamcast), Sonic Adventure 2 Battle (GameCube) all have chao gardens where you can do the most things and raise your chao the best and most effective. Sonic Adventure 2 Battle is the most convinient and shows you all you need to know about a chao, and it's a really good game to raise them in by using animals (and Chaos Drives) as a means of training them. Sonic Advance 1 and 2 can connect up to Sonic Adventure 2 Battle and Sonic Adventure DX via a Gameboy to GameCube link cable and you can exchange chao with.
That is very unlikely, although, considering it's for a 7-12 year old crowd, there's no reason not to put a Chao garden in. Especially considering that Sonic Unleashed would have been much more popular had there been any value in it after beating story mode. If anything, a chao garden would guarantee SEGA that Sonic Colors would be a huge hit. SEGA just seems to be against the whole Chao Garden thing. If it doesn't have a chao garden 'though, hopefully it will have special stages, fixing the replay value issue. It worked as Sonic Heroes excuse to be childish and not to have a Chao Garden. Sonic Unleashed had its chance to be of value to either the retro fans or the Sonic Adventure fans, and disappointed both fan-bases.
unleashed
You get the jewel chao in the GBA Sonic games such as Sonic Advance, Sonic Advance II, Sonic Advance III, and Sonic Pinball in their Tiny Chao Gardens. You can raise the rings by playing the games in the gardens or earning them in the story mode. CHAO COST EGG COLOR Regular FREE White (This isn't a jewel chao, but a regular starter chao) Silver 500 Silver (DUH) Gold 1000 Dull Yellow Ruby 5000 Redish Pink Sapphire 7000 Deep Blue Amethyst 8000 Purple Emerald 10000 Green Garnet 12000 Bloody Red Aquamarine 14000 Sky Blue Peridot 16000 Lime Green Topaz 18000 Orange Onyx 20000 (ouch) Black Moon 20000 Black/Dark Purple (This chao is only a rumor and I have only seen hacked versions of the chao, I have never seen this chao itself)
Yes, there are Sonic games after Sonic Unleashed. At the time of writing, the latest will be Sonic Generations.