|Staryu||Water||Surf||30%, 60% (Rippling)|
|Shellder||Water||Super Rod||30%, 65% (Rippling)|
|Luvdisc||Water||Super Rod||70%, 30% (Rippling)|
Head north over to the Black Belt running around in the sand and challenge him.
Trainer Battle: Black Belt
Continue west up the steps onto the grass. Follow the grassy path along until you reach the Battle Girl. Catch her attention and the two of you will fight it out.
Trainer Battle: Battle Girl
Continue along the grassy path all the way until you reach the stairs leading back down onto the sand. Just before you go down them, head south. You'll find a tree which you can Cut . Do so, then move through and grab the Max Repel .
Move back to the stairs and head down them. Head south, back onto the grass. Now head east, up the very long flight of stairs. At the top you'll come upon a large patch of tall grass. Turn on your Dowsing MCHN and search through the grass to find a Zinc hidden in a small gap in the tall grass.
Continue north through the grass until you reach a large boulder blocking your path. Use Strength to push it into the hole. Move over it and grab the Red Shard on the cliff. Backtrack down the large flight of stairs and head north out onto the beach. You'll see a thin sliver of the beach head back east. Follow it.
Feel free to take on the Ace Trainer splashing back and forth along the shallows.
Trainer Battle: Ace Trainer
Continue along the beach until you reach the Ultra Ball next to the large rock. On the other side of the rock, hidden in the sand, is a Heart Scale . Use your Dowsing MCHN to find it, collect it, then continue west. You'll reach a Fisherman. Talk to him to battle.
Trainer Battle: Fisherman
Backtrack past the Ace Trainer and continue north. You'll find a Parasol Lady relaxing near a deckchair and umbrella. Move over and fight her.
Trainer Battle: Parasol Lady
Take the path west, over to another Ace Trainer. This one's not looking for a battle though. In fact, he'll give you a coloured Flute ! Fist bump him in thanks, then head back to the Parasol Lady (the nearby shack has nothing to offer). Turn on your Dowsing MCHN and find the Big Pearl to the Parasol Lady's north.
Now use Surf to head onto the water in the east. Just across a small strip of water east of the Parasol Lady is a small island with Dark Grass on it. Move over and onto it. If you want to look for Double Battles with wild Pokemon here, feel free. In the centre of the patch of Dark Grass is an item, a Luxury Ball .
Head over to the eastern side of the island and use Surf to head off the island. There are shallows here we can be stood on. Move over and jump onto the shallow with the Fisherman and the TM29 - Psychic . Grab the item and challenge the Fisherman to a battle.
Trainer Battle: Fisherman
Now Surf back to where the Parasol Lady was. Continue north, along the sandbar with water to either side. You can battle either of the Fishermen here.
Trainer Battle: Fisherman (First)
Trainer Battle: Fisherman (Second)
Continue along to the beach on the other side of the sandbar. Turn on your Dowsing MCHN and search for the Pearl hidden around here. Grab it then move up the large flight of steps to your north-west. Move south-west and take the bridge south. You'll see a female Ace Trainer in the tall grass here. Time to take her on.
Trainer Battle: Ace Trainer
Continue south over the next bridge. Grab the Star Piece on the cliff, then head back over both bridges. Before the small trees which can be Cut to the north, there is a gap in the trees leading west. Follow along this gap and you'll reach some stairs leading down.
Take these stairs down and battle the Pokemon Ranger here in a Rotation Battle.
Rotation Battle: Pokemon Ranger
Once he's beaten, move through the grass and follow the small bit of sand leading west between the cliff and the water. You'll come upon a secluded shack. Talk to the Lass playing with her Wingull to receive a Power Lens and leave the shack.
Head back past the Pokemon Ranger, up the stairs and back to the main area. This time head north. Instead of using Cut on the small trees, let's first head into the tall grass leading north, to the east of the small trees. Follow it along until you reach the Pokemon Ranger. She's the last trainer in the area! It's a Triple Battle.
Triple Battle: Pokemon Ranger
There are two items nearby, sitting in the tall grass. One's a Blue Shard , the other a Max Ether . Grab them, then either continue to the other side or go back and Cut the trees; they'll both take you to the same place. If you continue through, move back to the small trees.
A Pokemon will call out to you. Feel free to move over and battle him, but it's optional. You might want to come back a little later when you're more powerful if you want to try and catch it. If you decide to go back and Cut the trees first, you'll come upon the Pokemon as you're heading north.
Either way, Save before interacting with it because you only get two chances to catch it!
Legendary Pokemon Battle
Cobalion is one of a trio of Legendary Pokemon that you'll be encountering from here on out and this guy hits like a truck. Its signature move Sacred Sword ignores your Pokemon's stat changes and does some hefty damage. To boost your survival odds, field a strong Ghost Pokemon or a Pokemon with the Reflect move.
Then it's a matter of using the same capturing techniques that you should be used to by now. Chuck a status ailment like Paralyse or Sleep, then slowly whittle down its HP. For reference, you can buy Thunder Wave from the Nimbasa City Pokemon Centre, which causes guaranteed Paralysis.
Similarly, if you fill the Habitat List for Reversal Mountain, you can grab False Swipe from the scientist near the eastern cavern exit. This move can't faint a Pokemon, so is ideal for bringing Cobalion's HP down to 1. It won't do much damage against Cobalion, since it's a Steel-type, mind.
If something goes terribly wrong, don't panic just yet. Assuming you saved beforehand, you can reload your save and try again or return after you've trained some more. Even if you don't have a recent save, you can encounter Cobalion again after beating the Pokemon League, in the same place, but at Level 65 instead.
Once you're done, continue on into Lacunosa Town.