you have to give it loads of fruits.until its stamina increases by 12 levels.
not nessicerily, all you have to do is pet it A LOT and give it fruits. the best thing to do is to take your chao to the doctor to see what fruit it likes and what traits it will be best in (i.e. my chao has an A in running, to i will give it running chaos drives)
(I will give my chaos lots of triangle fruits then)
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not many people know this but....i tried throwing my chao at the wall all the time...just for fun... after about 35 throws it evolved.... dont know if it'll work for you but it did work for me