I'm trying to make an applet that has a buttons in the right, where each button is corresponding to a certain pokemon. I already did it, but the buttons isn't fixed.they keep following the mouse. please help. This is my code:

import javax.swing.*;    
import java.awt.image.BufferedImage;    
import java.io.*;    
import javax.imageio.ImageIO;    
import java.applet.*;    
import java.awt.event.*;   
import java.awt.*;

public class choosePokemon extends Applet implements ActionListener
{

    private int countPokemon;
    private int[] storePokemon;
    private int x,y; //this will be the x and y coordinate of the button
    BufferedImage Picture;

    public int getCountPokemon(){ //for other class that needs how many pokemon
        return countPokemon;
    }

    public int[] getStoredPokemon(){ //for other class that needs the pokemon
        return storePokemon;
    }

    public void init(){
        x=0;y=0;
        try{
            Picture = ImageIO.read(new File("pokeball.png"));
        }
        catch( IOException ex ){

        } 
    }

    public void paint( Graphics g ){

        pokemon display = new pokemon(); // to access the pokemon attributes in class pokemon

        ButtonGroup group = new ButtonGroup(); //create a button group

        for( int a=0;a<16;a++ ){ // for loop in displaying the buttons of every pokemon(one pokemon, one button)

            display.choose( a ); //calls the method choose in which accepts an integer from 0-15 and saves the attributes of the pokemon corresponding to the integer

            JButton pokemonButton = new JButton( display.getName() ); // creates the button
            pokemonButton.setActionCommand( display.getName() ); // isasave sa actioncommand yung name ng kung ano mang pokemon
            pokemonButton.addActionListener(this); //isasama yung bagong gawang button sa listener para malaman kung na-click yung button
            pokemonButton.setBounds( x,y,50,23 );
            group.add( pokemonButton ); //eto naman yung mag-aadd sa bagong gawang button sa isang group na puro buttons(button ng mga pokemon)
            y+=23;
            if( a==7 ){
                x+=50;
                y=0;
            }
            add( pokemonButton ); //will add the button to the applet
        }
        g.drawImage( Picture, 120, 20, null  );
    }

    public void actionPerformed(ActionEvent e) {

        try{ //displays the picture of the selected pokemon
            Picture = ImageIO.read(new File( "pokemon/" + e.getActionCommand() + ".png" ));
        }
        catch( IOException ex ){

        } 

    }

    public boolean chosen( int PChoice ){ //this will check if the chosen pokemon is already the player's pokemon

        boolean flag = false;

        for( int x=0; x<countPokemon && !flag ;x++ ){
            if( storePokemon[x]==PChoice ){
                flag = true;
            }
        }

        return flag;
    }