Get easy money:
G to 5 island and Go north until you see Lady Cindy. She has 2 Hooppips and 1 Skiploom. Beat her and you will get $20000!

Open the Dotted hole:
Go front of the door and go to your pokemon party and use cut.

Item evolution:
Seadra-Kingdra trading Seadra with Dragon Scale held
Poliwhirl-Politoed trading Poliwhirl with King's Rock held
Onix-Steelix trading Onix with Metal Coat held
Scyther-Scizor thading Scyther with Metal Coat held
Porygon-Porygon2 trading Porygon with Upgrade held
-Lucario46