You corrupt the previous person's wish
Then you make your own wish
Relatively simple. Here are some examples to show you what I mean.
GenericGuy1: I wish I had a piñata
GenericGal2: Granted, but the piñata is empty
I wish I all the poor people in the world are rich
GenericMan3: Granted, but now, all the rich people in the world are poor
I wish I had a car.
And so on
Remember this is a game, so have fun
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Lets start
I wish pixelmon had Treecko