Map: Hyrule Field
Recommended Element: Darkness
Heart Container: Ganondorf
Heart Piece: Ganondorf
Skulltula: Defeat 1,000 enemies
Once the battle starts, take out the nearby captains but don't go too far. Stay close to Zant and defend him from the Hyrulean captains that will attempt to intercept him. A summoner will also appear in the Mountain Keep. If you can, head over there and defeat it. After taking out the captains, you'll get another mission update. This time, you have to defeat Link to prevent your allied Lizalfos from fleeing. Head towards Link's location and defeat him before he defeats all your Lizalfos deployed in the battlefield.
Link's attacks have predictable intervals. Don't underestimate his damage though; keep your guard up when trying to anticipate his attack, then evade at the right time so you can counterattack immediately. His weakness gauge can be depleted quickly so this battle shouldn't last long.
After defeating Link, Impa will make her way to the Fairy Fountain. You have to intercept her and defeat her before she reaches the fountain. Impa will mostly ignore you and keep moving so chase after her and defeat her as fast as you can. If ever Impa did reach the Fairy Fountain, you'll have a bit of time to spare before she replenishes the magic circle. This is a crucial plan that you need to stop because if Impa's able to summon the fairy, your allied base will fall instantly, causing you to lose the battle. Once she's defeated, Link will return and Zelda will rejoin the battle too.
The two of them will advance towards your main base so you have to intercept and defeat them before they capture your base. Don't make any delay because Link and Zelda are both powerful; they can easily capture your Keeps without much trouble. If you're able to intercept one of them, fight them until their HP is critically low. Once that's done, head towards the other and do the same. If they haven't reached your base yet, wait for them their while taking care of the ordinary soldiers. With both of them at low HP, you should be able to defeat them together in a short span of time.
You have to defeat them together; otherwise, one of them will be fully revived to join the battle. As much as possible, fight defensively. Don't just attack blindly as their attacks can easily take out your hearts rather quickly. Save your SP attacks when you're caught in the middle of their combos or when their HP is very low.