How do you make a Hero None Swim chao

The easiest way is to raise the chao with hero characters (Sonic, Tails, Knuckles) and don't give it any animals or chaos drives and when it evolves it will be a hero stamina (or 'none') chao. Then give the chao almost nothing (apart from food) other than swim animals (seal, otter, penguin) or yellow chaos drives. It will gradually change in looks and become a hero stamina swim.