java - Storing data for a pokemon like game

The game I'm developing is close to Pokemon. How should I store the data? I am currently thinking of text files where I save the map and have a corresponding textfile for the trainers and their teams on the "current" screen. However this leaves me with a LOT of textfiles.

At the moment I'm thinking of something like this, however I haven't coded this yet so I can still easily change this.

@Trainer;5;
@Pokemon;12;1;3;4;6;
@Pokemon;13;1;2;5;
@Pokemon;13;1;4;5;
@Pokemon;11;1;3;5;

@Pokemon;16;1;2;7;
@Trainer;3
@Pokemon;13;1;4;5;
@Pokemon;11;1;3;5;
@Pokemon;16;1;2;7;

Where the first column is the "type" of the entry. If the first is Trainer the second is his number of Pokemon. If the first is Pokemon the second is the level, the third the type, the fourth/fifth/sixth the IDs of his attacks. (How should I store the attacks? A seperate textfile where I just store the attacks?)

I am currently finding myself with having such a huge amount of data that I'm starting to wonder wether I should be using a Database instead?

Edit: Using Java(LWJGL).