Mt. Corel:
[Items to find: Wizard Staff, Star Pendant, W Machine Gun, Turbo Ether, Transform Materia, Phoenix Down (10), Power Source, Mind Source, Tent]
Leaving Costa del Sol, head west to Mt. Corel, to get there, follow the mountain road and you will arrive at a river. The entrance is in the mountains to the left of the river.
Head up the hill and talk to the man sat down, he will tell you that a "Black Caped man" came by here. Continue up the hill, on the next screen, continue up the hill.
You will now arrive at the Corel Mako Reactor, there is nothing to do here now but remember where it is for later. For now, head down the stairs and past the Reactor, along the bridge to the bottom of the screen. There are a few paths on this next screen, for now, just run along the tracks in front of you.
You are now on a huge train track that dips and rises, as you run along, you will fall off; there are 2 items you can collect a Wizard Staff (Left) and a Star Pendant (Right), hold the direction you want and keep pressing (OK) to move in the direction you want. Climb back up to collect the item and return to the main railway line.
On the line are some more items; W Machine Gun
(A), Turbo Ether
(B) and Transform Materia
(C). Keep heading east until you reach a fork, head up (1) and you will see your party stuck at a bridge, run along the track until you get to a small shed, enter it and use the controls to lower the bridge.
You can climb the wall near the shed which leads to a nest, inside you will find chicks surrounded by "Treasure", this treasure is 10x Phoenix Down
which you can take, but if you do you have to fight an enemy.
Once done, head back and take the lower path (2), following your party from earlier. At the end of this track, there is a split, take a left and head down and under the track where you will find a hidden cave with some more items; Power Source, Mind Source
and Tent. Head back out and up and exit by the other route to the right. Head along the bridge into North Corel.