ScoreboardScroller.java

public class ScoreboardScroller implements Runnable {
	
	private final Plugin plugin;
	private final Thread thread;
	private final Scoreboard scoreboard;
	
	private String title;
	
	private boolean usetTitleScoreboard;
	private boolean useScoreboardPlayer;
	private boolean autoUpdate
	private boolean destroy;
		
	public ScoreboardScroller () {
		this.title = "Default title";
		this.plugin = Bukkit.getPluginManager().getPlugin("MeuPlugin");
		this.scoreboard = Bukkit.getScoreboardManager().getMainScoreboard();
		
		this.thread = new Thread(this);
		this.thread.start();
	}
	
	@Override
	public run() {
		while(!destroy) {
			if(autoUpdate) {
				for(Player player: Bukkit.getOnlinePlayers()){
					updateScoreboardToPlayer(player);
				}
			}
			if(scoreboard != null) {
				if(usetTitleScoreboard) {
					runUpdate(scoreboard, scoreboard.getObjective(DisplaySlot.SIDEBAR).getDisplayName());
				} else {
					runUpdate(scoreboard, title);
				}
			}
		}
	}
		
	public void runUpdate(Scoreboard score, String string) {
		for(int i = 0; i < string.length(); i++) {
			String title = ChatColor.RED + string.substring(i, string.length()) + string.substring(0, i);
			if(title.length() > 16) {
				title = title.substring(0, 16);
			}
			Objective objective = score.getObjective(DisplaySlot.SIDEBAR);
			objective.setDisplayName(title);
			try {
				Thread.sleep(200);
			} catch (InterruptedException ex) {
				
			}
		}
	}
	
	public void updateScoreboardToPlayer(Player player) {
		if(player.getScoreboard() == null || (player.getScoreboard() != null && player.getScoreboard().equals(scoreboard))) {
			player.setScoreboard(scoreboard);
		}
	}

	public ScoreboardScroller destroy() {
		this.destroy = true;
		this.thread.stop();
	}
	
	public ScoreboardScroller setTitle(String string){
		this.title = string;
		return this;
	}
	
	public ScoreboardScroller setScoreboard(Scoreboard scoreboard) {
		this.scoreboard = scoreboard;
		return this;
	}
	
	public ScoreboardScroller setAutoUpdate(Boolean bool) {
		this.autoUpdate = bool;
		return this;
	}
	
	public ScoreboardScroller setUseScoreboardPlayer(Boolean bool) {
		this.useScoreboardPlayer = bool;
		return this;
	}
	
	public ScoreboardScroller setUseTitleScoreboard(Boolean bool) {
		this.usetTitleScoreboard = bool;
		return this;
	}
}

Caso encontre algum erro ou tenha alguma sugestão, me contate ou comente por gentileza.

Antes de usar Crie o Objective SIDEBAR

Scoreboard scoreboard = Bukkit.getScoreboardManager().getMainScoreboard();

Objective objective = scoreboard.registerNewObjective("Top Kills", "dummy");
objective.setDisplayName("Top Kills");
objective.setDisplaySlot(DisplaySlot.SIDEBAR);

Como usar:

ScoreboardScroller scroller = new ScoreboardScroller();
scroller.setAutoUpdate(true);