This is VERY hard to get. Basicly, take perfect care. Try to get as much training as possible (although once I got Mimitchi with only two training bars). Always clean up waste as soon as it happens. If you let the hearts drop below one empty, let him (or her) sleep with poo next to his bed, or don’t get any training, there is a 98% chance you will end up with one of the characters below.
From what I have heard, this is one of the hardest characters to get. I myself have never had it, although I am going to try. Don’t let it drop below two hearts, and try to take *ALMOST* perfect care. On the night before you expect him to change, let him sleep with something wrong (like a poo or an empty heart – but make sure it’s not below two, or you might end up with a not so cute character, Zukitchi/Masku-chi). If you follow these instructions exactly you will now have Pochitchi/Ginjirotchi!
You could say these are the worst of the good characters. I don’t think Zukitchi is cute at all, but I am quite fond of Masku-chi (although I am afraid to try to get him due to the fact that if I did, I could end up with a Zukitchi). Take average care, and every now and then let it sleep with poo. Let the hearts drop down at some point, one in hunger and two in happiness. What I think is interesting about these critters is that they can turn into the secret character.
Both of these I have only had once, but I know how to get them. Do the same you would do to get Mimitchi/Mametchi, but in this case you are aiming for a teen rather then an adult. I got both of these with a Kuribotchi, just to let you know.
These are supposed to be fairly easy to get, although I never suceeded. Tarakotchi goes up to the screen to give kisses. They are obviously just two mis-understood sweethearts. If you want one, take the worst care possible. When it is first born, feed it only one meal and one snack. Never let the hearts go above one full. As often as possible, let it sleep with poo next to it’s bed. This is a bit sad, because I think Tarakotchi and Kusatchi are very sweet and they are two of my favourites.
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Hope this was helpful to you!