Go back the direction you came from and, as you approach the area where you fought the Mobile Type 8, you should notice that there is a new structure that has appeared with some ladders and platforms attached to the walkway.
Climb the first ladder but do not climb the second ladder. Instead, walk up the sloped ramp to the higher level.
Follow the pathway until you reach the area the room that Seifer, Rinoa and Adel were in.
In Game Description: Esthar’s ruler before Laguna and company confined her. Released by Ultimecia, and regaining Strength.
This fight adds a new layer of complexity in that there are two ways for you to see a potential game over screen. The first is by having all of your party members be KO’d, like normal, but the second way that you can lose this fight is if Rinoa dies while she is attached to Adel, and some of your attacks could accidentally hit her if not properly planned out. Make sure not to accidentally hit her!
Use curative spells to keep Rinoa alive. 
X-Potions, 
Curaga, or even a Regen can go a long way. Each time Adel uses an attack she will Draw HP from Rinoa, slowly sapping her HP, so you will need to keep her healed up throughout the battle.
Using regular attacks is highly recommended to make sure that you don’t hit Rinoa. You should even avoid using any of Squall’s limit breaks.
Make sure you 
Mug Adel before the end of the fight to pick up a 
Samantha Soul.
You will be treated to quite a few scenes of dialogue once the battle has concluded. Save your game at the Save Point (to make sure you don’t have to repeat the fight against Adel) and continue along with the story.
Through this next section of the game you will have to do battle with a number of easy-to-defeat Sorceresses. No strategy is required - attack them, kill them, and repeat.
The last Sorceress which looks like a mutated snake and this one will require a few more attacks, but again, its fairly easy to defeat.
Wander through Edea’s House and out the back after the battle to reveal Ultimecia’s Castle. Continue down the pathway towards the beach and then up the chain towards the castle.
As you are crossing the chain you will notice three portals along the way on the left side of the screen. You can jump over to these portals in order to return to the World Map, but as mentioned above, most of the towns and side quests have now been locked out.
At this point, you have two choices. You can either continue up to Ultimecia’s Castle to complete the final portion of the game, or you can return the main world to level up your characters or complete the remaining side quests that are there.
36) End Game Side Quests
A full list of the side quests and mini side quests that you can complete before finishing the story of Final Fantasy VIII starting by getting the Ragnarok back.
37) Ultimecia’s Castle
Moving on to the final chapter of the game to defeat Ultimecia after you make your way through the last dungeon.
