ok the key should be just outside of hotel grand lake (the hotel the girls at) in the back where the lady who heals your Pokemon not in the hotel itself but outside in the back you will need the scanner to find the key but its on the pavment :D
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Go just above the little hotel outside Sunnyshore City, then use the Poketech you use to find hidden items and you should find it not far from the exit.
The moon stone is used in Pokemon Diamond to evolve certain Pokemon. You can find one by looking in the Underground.
You can find Aron only in Diamond.
She gives you a lava cookie as a reward. Go into the hotel that's booked, then go outside and walk to the left and look up then press A then you should find it
No. A hippo isnt a pokemon.