The final battle

[Squall of SeeD]

2)I believe she is possessed by Ultimecia yet in the second disc.

She was possessed by Ultimecia throughout the second disc. It's at the end of it that she is freed. As for being possessed by her on the third, the things she does would be of no help to Ultimecia. Again, the information regarding Ultimecia being from the future was never used against SeeD in any form, nor was it ever implied that Ultimecia wasn't from the future.

Further still, Edea couldn't have been possessed by Ultimecia at that point, as she was no longer a Sorceress. When Ultimecia was defeated in Galbadia Garden, Edea's powers left her and went to Rinoa. That's why Ultimecia was able to possess Rinoa immediately after the battle and why we're later told that Edea had given up her powers without even knowing it:

Zell
"S'up Squall!!!"
"So glad you're safe!"
"I hate to tell you this now, but we've got major problems down here."
"Well, here it goes!"
"Some big thing called Lunatic Pandora came out of nowhere."
"Matron couldn't achieve what she set out to do because of it. Which is ok."
"Matron's not a sorceress anymore."
"Matron gave away her power to someone without realizing it."

Squall
(To Rinoa......)

(Bolded for emphasis.)

Ultimecia possessed Rinoa in Galbadia Garden because she inherited Edea's powers. Ultimecia could only possess Sorceresses. Were that not the case, Odine wouldn't have said "Sorceress Ultimecia comes from ze future to possess ze sorceress of present day" and she wouldn't have needed to possess other Sorceresses to get to Ellone in the first place and would have just possessed Ellone herself.

Ultimecia could not have possessed Edea at that point.

I believe that she is Ultimecia.

Based on what? If it's any of the things you've presented so far, then take into account how I'm refuting them all with in-game (canon) facts.

But to answer your question:Ultimecia is using Junction Machine Ellone.So she can use some sort of cassete tape to send its content through junction.Maybe she record a speech in the tape and put it on the machine to send.Maybe the machine receives visual signs from Squall´s era.So it is not implied that she uses it directly on her head.

Ultimecia's consciousness is sent into the past. That directly implies her mind being connected to this device in some way. Does it necessarily mean it's on her head? No. But that's irrelevant, as her mind is still connected to it.

For that matter, the term "Junction" is used. We see "Junction" used to refer to the Junctioning of oneself to a GF (something which causes those who Junction theirself to the GF to lose their memories over time with GF-usage, meaning it directly affects their mind), and Ultimecia Junctioning herself to Griever, with their bodies actually becoming an almagmation of Ultimecia and Griever, in which case there's still a strong connection present.

Concerning your question about Adel.Ultimecia was herself possessed by someone on the future(relative to Squall´s time).

Support this with in-game information. It's never implied by the game, though, so that will be impossible.

So I use the word "Ultimecia" to sustitute the name of this powerful being.The person who uses the cassete tape is not the "Ultimecia" from the game but a more powerful being.

Again, where's your in-game support for this?

And I didn´t said Ultimecia was Adel but True Ultimecia is (Ultimecia Transforms into Adel).

Except she doesn't. She transforms because she had gained the Sorceress Power of all the Sorceresses throughout history, something which the game tells us was her goal in using Time Compression:

(The Tutorial's description of Time Compression.)

Time Compression

A complete mystery. Various states of "present" are believed to become compressed. Sorceress' power from many generations may cross over to give 1 sorceress great strength. No one knows what effect this may have on regular human beings.

(Bolded for emphasis.)

(The description given when using Scan on Ultimecia when fighting her first form.)

A sorceress trying to change the world by compressing time and taking power from all sorceresses.

(What Ultimecia says before the battle with her begins.)

"Your vain krusade ends here, SeeDs."
"The price for your meddling is death beyond death."
"I shall send you to a dimension beyond your imagining."
"There, I will reign, and you will be my slaves for eternity.
HAHAHAHAHAHAHAHA."

(Bolded for emphasis.)

(The information given when using Scan on Ultimecia's final form.)

Ultimecia, transformed to absorb all time and space. Absorbing
all existence as we speak.

The game couldn't have made it much more obvious that Ultimecia's goal was to essentially become God by acquiring the power of all the Sorceresses in history, then using it to change time and the world itself to suit her. She transformed into that more powerful form because she had gained the power she sought and was then absorbing all existance to become God. It had absolutely nothing to do with Adel.

By the way, you completely ignored my points concerning Ellone's power only working in such a way as for her to send the consciousness of someone she knew in the present to someone she had known in the past, as well as my point that if Adel were killed in the past, she wouldn't have been around in the game's present.


At this point, I'm not so sure that I'll bother responding again if you can't offer some actual in-game support for your argument, as it's insulting to myself and anyone that you would try to carry a debate with to argue something with no support from the source material in question.