Ok,I'll tell you.
The good thing about getting these charecters is that you can get them on the same generation.
Kinokomotchi:On the 2nd generation and up you can get kinokomotchi if BOTH the parents have high amount of training(also known as decipline)and take pretty good care of your baby.
Memetchi:On an even generation,take perfect care of your Tamagotchi EXCEPT leave ONE HEART empty on BOTH happy and hungry and you'll get a Memetchi.Also use this method for Kuchipatchi.