After defeating Tabasuko in the cave, you will step outside and get a phone call from Sungki. He tells you to get back to Musa's house so Musa can tell you about the Antenna Tree. The Antenna Trees are what allow you to travel from one town to the next, sort of like a portal. They are massive-- about as wide as a house-- and have a huge entryway so they're hard to miss. They are usually guarded or kept behind locked doors and during the game you have to go through a lot to get access to them. Head back to Tulunk Village, but on the way a monster will block your path. He will challenge you. It's Punika, but he's not hard to beat. Take care of him and then go talk to Musa, who will open up the Antenna Tree for you and ask you to go to the next town.
KELINA VILLAGE
Kelina is another small village. Head south once you arrive and you will see some buildings and part of the river. You can train your monsters around this area, but first you have to get past a cat-like monster. He won't let you by, so go into the house to the right of the Store. There is a blob monster in there who will tell you that the key to the Antenna Tree has been stolen. After talking to him, you can go back and fight the cat monster Sukori. He will disappear and once you step past him, Bek's friend Miyor will come up and talk to you about a cave on the northeast end of town. Go up that way once she leaves.
At the cave entrance you will see a blob monster named Gumi. He is really easy to beat if you have Kuribute (Gumi is a Lake type monster) and he shouldn't be too much harder to defeat on the Speed version either. Once he's gone you can go inside the cave. There are a lot more bad guys in here and also a monster called Rodansa that looks like a tornado. He always gave me problems because he is a Sky type and is good against Kuribute, so watch out for him. A Hill type monster like Osie or Netaro can help out. You might want to switch Kuribute with one of them for a while. Go to the "Using the D-Shoot Phone" blog to find out how to do this.
The cave is not hard to navigate, but is long. Just keep following the path and you will find Nerikara again. He seems afraid that you will push him off the edge of the cliff and gives you a key. Keep going and when you get to the door, just unlock it and go inside. Tabasuko is there (apparently talking to herself) and soon challenges you again. She will start with Surugem this time (a Sand type monster). If you have Fanges, watch out! You'll be at a disadvantage. After you defeat her you can get the treasure and get out. Return to the same house next to the store and you will gain access to the Antenna Tree. The blob monster will also give you several nice gifts.