almost all guides and videos online are for the Playstation Re:Chain remake but I like the GBA version so here's what I'll tell you.

This fight happens in the second story door (the one with the crown on it that makes events happen) on DESTINY ISLANDS in Sora's Story

I beat him quickly so the images are gonna be a bit scatter brain but this is him. Consider this a text based guide. As you can see, Darkside's got a HUGE Heath bar!.

To get him down to blue, you're gonna want to have the JUDGEMENT Sleight. This sleight is obtained on Destiny Islands just about 2 rooms earlier in a chest.

Once you obtain it, you execute it by combining one aero card with 2 attack cards.

You're gonna want atleast 4 of these to get him down (4 aeros and a shit-ton of keyblades)

This gif is from Re:Chain (thanks KHWiki) but it works the same in the original. The blade will aim at Darkside's head while he's in the air and unleash a flurry of strikes. This'll get him down from like 4 or 5 health bars to just 2 (Blue & Green) before he even has the chance to attack you

When he DOES finally start attacking, you MUST use dodge roll. I know it's hard but at this point in the game you should have a decent number of heals if you mess up.

Now. You're our of aeros. This is when you go crazy with Sleights. If he just reached the ground, Cloud is a great card due to his heavy hits. If you have 3 cloud cards he can even fly to attack. I only had one cloud card so i gotta keep talkin'

Thunder is also useful.

When he gets in the air again, some card combos work in the air, these arw gonna be super useful as he'll only have half a bar left if you swing correctly.

Keep dodging and swinging, and you should have him down.

After this fight is a cutscene. Keep her safe～

Over the previous week, a pilot animatic for a cancelled Kingdom Hearts was released to the public on YouTube by director Seth Kearsley. At the time of writing, Kearsley has since set the pilot to Private at the request of a friend at Disney, and it is no longer available on his YouTube channel.

However, it was up long enough that I got a chance to see it, and I loved it. So, I decided to redraw a few shots from the pilot, once again using Shiro Amano's style as a reference.

The Power Within- as I've mentioned before, Moxan has the power to control and command all manner of creatures of darkness (Heartless, Nobodies, Unversed, and theoretically ect.) With weaker creatures the effects can go from from full marionette-like control to playing with a street cat, while with stronger ones, like OrgXIII members, its more like a generally calming and more persuasive aura.

She can also take any weapon she can carry and wield it like a bat (she also has definitely done that with random dead keyblades at the Keyblade Graveyard), and given a shooting weapon, like a gun or a bow, she could hit a target relatively well.