Get higher Chao ranks
Get the required Animal or Chaos Drive for the type of Chao you want. For example, the Yellow drive or Sea Otter for swim. Then, give them mostly that color of Drive or Animal. Eventually they will evolve into an adult. When this happens, if you gave them mostly yellow for example, the adult Chao will be a swimming type and if your rank in swim was, for example an A rank, it will go up to S. To improve the letter rank in Stamina, make the Chao a normal type.
Added by: CheatFreak
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Sonic Adventure 2: Battle
Tips and Tricks