Here's a trick. Take an animal, stand close to a chao(it must be facing you) and place the animal down in front of the chao. If done right, the chao will get the stat increase, and you will be able to reuse the animal.
As for your Sonic Q. I never really tried, But 1 way would be is to let it die and reincarnate till its speed is up in stats to about 500-1000 when it hatches, after that, it will start looking like the sonic chao you mentioned well before Lv99.
>GJS<"It all starts with this, a jewel containing the ultimate power." -Shadow "I still remember what I promised you, for the people of this planet. I promise you, REVENGE!" -
No one knows Shadow better than me. Or likes him more either. Go ahead, try me.