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n one of the small houses, there's a lonely old man whose wife had passed and became quite lonely, and asks you to give him something cuddly to raise and cheer him up, he wants something under level 5.
Few in game days and when you return, he's not there, with a pokeball in the middle of the floor, with a note attached to it and your mon inside.
The note seems to imply he died, happily, but still died, and is extremely greatful towards you for giving him company in his last few days. You get a comet shard and get to take back this pokemon.