Bug: After the S.S. Anne is gone, go to the guard that says that the ship is gone. After facing him, keep pressing right and then quickly push the START button. Save and reset. If everything's OK, you should continue facing right. Select a Pokémon that knows SURF and use this move. Instead of surfing to the right, you'll surf ON the guard! Press down twice, and you'll enter the S.S. Anne again.
Bug: After entering the Cycling Road from the northern gate, go all the way left. You'll see some trees beside the barrier. Then go south, until a point water appears below the trees. If you go up again, you'll see that the trees that were at north have now transformed into water. If you keep going up, and then right so the water is not seen, and then left again, the water has now transformed into trees, again.
Other mistake: If you don't have the Silph Scope, you'll run into GHOSTs at the Pokemon Tower. However, in the middle of the battle, if you see any of your Pokemon's stats, and then return to the battle, the GHOST will be gone and you'll be able to see the real Pokemon behind it.
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