look 4 ur tama often, refill dropped hearts at once, clean up poo at once, react on every attention call (raise discipline), play a lot and dont let it get overweight
How I got a Mametchi was: First I got the little bumpy toddler by not letting it become overweight, then for a teenager I got pirrotchi (buy playing lot's of games), and then I treated it average and it turned into a Mametchi. (YOU CAN HAVE YOUR TAMA LOOSE MORE THEN 1 HEART AND IT CAN STILL TURN INTO A MAMETCHI.)