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This is probably a technique people figured weeks ago but
>go to the second entrance to the sewers when it rains
>deattach your joycons
>use a rubber band or whatever so the left one keeps the joystick moving downwards
>keep the right one on your hand
>just spam A and your character will enter and leave the sewers constantly
>it's raining so Goomy will spawn just in front of you and every time you exit is a new roll
>do whatever while you keep spamming A, check the results every once in a while
Did it for like an hour the other day and got no results, then did it again today and just when I was getting dressed to buy some groceries checked and I got a shiny alpha. Then moved a little and discovered I actually got two of them at the same place.