Here is a Walkthrough on how to beat Wilfre easily!
1. Pause the game
2. Hold down the L button
3. Punch in AXBBY
You now have invincibility, you'll need it for this battle.
Wilfre will try to throw stars or tridents at you. He will throw 3 of each. After he is done, jump up and slash at him with your sword. Most of the time he will dodge easily. After he has finished attacking you, he will stat moving. This is your chance to get him! He won't dodge while he's moving, but he is very quick so press B fast!
When he getes down to about half health, e will say 'Oooooh, prepare to die!'. The battle plan will be slightly different. This time just wait until he finishes attacking and slash him when he moves.
After a while, he will be beaten.
Congratulations, you have now beaten Wilfre!