You have bought Staryu! Take good care of it and it will love you!
Below is some more information on Staryu:
Evolves into Starmie.

Please, take this with you.

<--potion received-->

And this.

<--pokémon liscence received-->

Before that is any use to you, you need to get it signed by an official
pokémon league member. I know, the person over in the corner there, he's
just come out of battle and is letting his pokémon rest.
Good-luck!

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