I don't really know, but most probably they thought it became boring, thought it took too much time to put in, couldn't be bothered to do it or completely forgot about it.
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sonic chronicles has a chao garden, but it's not as good as the sonic adv 2 on the GCN chao garden
NO
SA is for the Dreamcast, while SADX is for the GameCube. SADX has the 12 Sonic Game Gear games as unlockables. SADX has 60 missions in it. SADX has a black market in the Chao Garden. SADX allows you to put your chao in the Tiny Chao Garden. SADX awards you for collecting all 130 emblems. SADX has Cream cameos. There are more.
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.
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