Anything electronic can become wet without too much problems providing you leave it off. Let is dry for a week or two and then you can simply power it up again.
The problem you have is that this GBA has been turned back on when it was still wet and it short-circuited. It is now permanently damaged and most likely is not worth repairing (a new set is cheaper).
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Rabyd Rev -- 2 Timothy 2:15
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