Alright. First things first I suppose.
Level: 80 OR above
Weapon suggestion: Decisive Pumpkin
Stats: Level 65 OR above
Growth abilities:
Try to have Drive Forms maxed out, Final Form must be maxed.
Abilities needed for this strategy:
Both combo plus, finishing plus, guard break, explosion, and guard
Recommended Items: 4 Ethers and 2 High Potions
As soon as the fight begins, look at Terra's hands during the cutscenes. For a few splits seconds right before the fight he will begin to move. In this time frame he will begin his attack which you can then react to. You never want to guess. However in my opinion it's safest to just dodge roll away.
He will usually start with one of four moves, Rising Sun, Ultima Canon, Keyblade Glider, or Curse Mark. I'd say that Rising sun is the easiest to deal with. Dodge Roll Is a effective way to dodge all of them. You just need to get the timing right.
If he starts with one move, until he reaches 5 life bars, he will be stuck in a set pattern. This will consist of his opening move, and 1 or 2 other moves (Not including the Keyblade Whip counter). During this time he will never use more than that. It's completely random and you have to be ready to react to it.
Once the real fight begins and you manage to start attacking him, land 2 combos and hit him with guard break, but NOT your second finisher Explosion for both of them. On your third combo after, then you can finish with both finishers. This will hit his revenge value and he will retaliate. If you are lucky, he will just use a Keyblade Whip. If you aren't lucky, he will disappear into lasers and attack you with Rising Sun. (Note: If you reflect his Ultima Canon back into him, only do 2 combos.)
If he counters with Keyblade Whip you have three options. First judge how close you are to him, and then react. If you are far enough away from him, you may be able to escape from his attacks by Dodge Rolling OR using Quick Run. (I always unequip Quick Run as it can screw you over when you meant to Dodge Roll.) If you are right up against him, use Reflect in your shortcuts and just spam until it's over.
Rinse and repeat until you reach almost the 5th bar of health. Terra has 2 set points where he will break out of a combo no matter what. One is right near the 5th bar, and the other is near the 10th bar. These points reflect a turn into a different phase of the fight. The second phase will just be a basic power up, he'll add a move or two to his arsenal of set attacks and he'll use lasers more often. Just continue as you were before and be a bit more cautious. If you are trying to not get hit by either of these retaliation points, watch his health and when he gets near the line, use Thunder to edge him to the point.
Now as we reach the lower end of his health, this is where the hard part starts. Well, hard if you don't know what to do. Terra will come back after turning into lasers and activate his DM (Desperation Move) after you hit his 10th bar of health. Oh, an easy way to dodge his lasers is to just glide in a wide circle.
Okay, once he starts he will raise his Keyblade and lightning will come off of him. At this point you want to be close to medium range from him. If you are too far, he will teleport and it can mess your timing up. You also want to be towards the edge of the map. Once he finishes charging up, he will glide right towards you. This part is important, once he's right in front of you, guard 3 times. Then jump into an aerial dodge and glide straight. (Note: You need Glide level Max for this to work.)
He will then chase after you using gears to try and grind into you. After his first surge, he will activate a second surge of gears. If you are flying forward he won't catch up to you. However as soon as you get past him and he goes off screen, fly towards the edge of the map and land in a spot where you are sure you have some distance between you and him. Turn and put your back against the wall and lock on to Terra.
Once this is done, if you followed my instructions he should be finishing his gear attack and raising his sword swiping twice. He will then teleport and barrage you with attacks. This is why you put your back to the wall. If you hadn't, he could attack you from behind. As soon as he teleports, guard 4 times in quick succession. Don't bother locking on. After the 4th guard Terra will then teleport to the left or right of you. Try to spot which side he is on, and Dodge Roll in the direction he is going. If you can't, then don't worry about it. Just Dodge Roll out of the way. If you completed all of this correctly you will have successfully Survived his DM and you are ready to attack him again. He will always be open to attack at this point.
Now, it's all up to you. You have to dodge and retaliate as needed. Don't worry though, the fight is almost over. Just push through those last 5 bars and use all the information here. With lots of skill and a little bit of luck you will surely win. If you are still having trouble, I'll add a video of me implementing these tactics at the end of the blog.
As a bonus, here are some tips.
His most dangerous attack is Curse Mark. He has two different kinds, and depending on the color he can lock your Magic OR Attack. Dodge at any cost.
You can reflect the Ultima canon back at him to deal some damage, however this will add revenge value as if he had been hit by a full combo. (If you don't understand revenge value and what it is, let me know.) However if you are to far away to do this, you can dodge roll into it to null it's effects.
Duck Flare is a very useful ability as it allows you to go invincible for a short while. It's a nice little break from the fight, but be wary of relying on it too much as Donald has to be alive. A rarity I know.
Magic is your best friend. For short cut options I recommend having on Reflect, Thunder, Heal, and Ethers.
Drive Forms are useful, however the only two usable in this fight is Final Form and Limit Form. Don't waste your gauge on others.
If he activates his Bow and Arrow, he will most likely teleport. Don't freak out, you can time when to dodge by listening to him. Right when you hear him warp in, Dodge Roll. If he does manage to catch you, don't sweat it too much. At this point feel free to pause buffer. This means pausing and unpausing rapidly to try to and stop the options from moving so fast. You can then select the correct option.
Seriously, unequip Quick Run for this fight. You will need to Dodge Roll so many times that you are bound to screw up and accidentally Quick Run. Don't seal your fate to a long button press.
Video stats:
Level 99,
Decisive Pumpkin,
Proud Mode,
All stats above 80
Sources
Channel
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P.s. To whom it may concern, I apologize for my abrupt disappearance. This was due to my college classes taking up most of my time. I can't be very active, but I will continue to post when possible. Thank you for your consideration.