Mystery island
How to get o mystery island:
listen up.
Your pokemon have these numbers randomly assigned to them everyday called something like break stat points.
If it happens that one of your pokemon have a break stat number of 0, the island appears.
It's only there for a day because the numbers for your pokemon change everyday.
Also, the number changes when you deposit the pokemon in the box, so you can try doing that.
We have more cheats and tips for this game here, Pokemon Ruby cheats
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