This Chao hasn’t even been reincarnated once yet and it has straight S grades for it’s 3 most important skills.
For the record, it’s entirely possible to raise a Chao to have all S grades. If a Chao evolves into, say, a power-type Chao, it’s power skill will be upgraded by one grade higher i.e A chao with a B in power will get an A for that skill if it evolves into a power-type Chao, A Chao with E in swimming with get a D if it evolves into a Swim-type.
So if you reincarnate a Chao multiple times and improve it’s grades by evolving it wisely each time, it is possible to get a Chao with all S grades for it’s skills.
Cool huh? Just very time consuming.