Battling
From VDragonball RPG Wiki
This portion of the guide includes Missions and Player vs. Player
The missions section already explains what it is in-game. So there's no need to go over that.
The player vs. player section however must be gone over.
Player Vs. Player
Fighting against a friend? Well that's simple, just click and select your opponent. They have a few minutes to respond. If not, then it expires and you must resend the challenge again.
Ambush Player
You can only ambush those who are 10% higher or lower then you, it's no longer anyone who's in a clan. It's anyone of level range of you. So it's possible you wont see anyone, or you will see a lot of people. Depends on your level.
Challenge Clan Leader
Challenging the clan leader will allow you to overthrow and take control of whichever clan you're in. Which removes the leader and makes you in charge, this is important if your clan is not as active as they use to be. Be careful with this option.