no. It is pathetically easy
beat the boss
by beating the final boss
When you beat the mid-boss, from the city in the sky.
You get it in the sky temple when you beat the mini boss.
Go back to Castle Town and see what you find!
The ball & chain? You have to beat the mini-boss in the mountain mansion place.
You have to beat the mini-boss in the first temple, which is Ook, a white monkey
in hyrule castle
The last level on Zelda twilight princess is hyrule castle where you face the final boss ganondorf.
In Twilight Princess, like most Zelda games, you are not able to save after defeating the final boss. This allows you to go back and complete any side quests you want and/or beat the boss again if you'd like.
It's on the map.
deffet the monkey mini boss