Okay... to get you should keep it at about 90-99 pounds. Let it get sick a lot, especially as a toddler and as a teen. Play Bump a lot. Or, in V4, you keep its pencil points at about 60, but keep the others VERY low.
Now, wanna know how to get ? Get ALL of its skill points at 150 or above BEFORE it is an adult. Then, you will get Nazotchi!