I was too lazy to make up the elemental adventure so i skipped

Yaya: huh? A white room? I thought this would take us to the core of the train
Gopal: dey don't tell me you lead us to the wrong way!
Kaizo: enough, i think its time you really tell us why you lead us here
Fang: huh?
Kaizo: from the info we gathered, you we're absent from Mata for a very long period and even if you weren't there was no sunch evidence of them having a record of this train and that tech your wearing, no matter how good it is, it can't just scan and imedietly have the answer to how we can stop the train so what's your real goal here? Why did you bring all of us here?
Ali: mh. . . . . Geuss not all of you are dumbass after all.... Fine. You want to know how i know so munch about this thing? Why i lead all of you here? See for yourself.

Reverse Fang narration

Ali steps up and hold a crystal sphere in hand, he throws it on the ground and it made the room remaking a... Memory, I'm quite impress with the place we're in, its really beautiful, i spotted a big tree ahead, it has 2 wooden swing on opposite sides to it

Than i saw the younger version of Ali walking up to the tree and sat down on a swing, he sat there quietly for a few seconds until

Ali: so ... This is it huh? This is goodbye than...
???: Only temporary, unlike the old man, i can come back kiddo
Ying: ey? That voice... The boy on the other swing....
Yaya:  BoBoiBoy???
Ali: how are you going to come back?! That old man never gives us a god damn call and the first time he calls me, he told me your dead! How do you expect me to belive the dead can come back to life?!
Reverse: thats bcz i have a way, when i die, it was only my body that weakened, my mind will move to another conscience or vessel if you will, i just need to stay in the universe lòng enough until i can properly manifest another body, that way i can come back
Ali: why even put yourself to this? Why did you just let yourself get killed?!
Reverse: it was the only way kiddo, they won't stop if i still live so if i don't live right now than it will all be over, it had to be done
Ali: tsk... We really are like them huh...
Reverse: hahahah yeah who knew? A space superhero dad and a badass secret agent mom, we ended up following in their footsteps... I just met this "power shpera" and got my powers, than i became what people call me "a hero" and than i joined this stupid organization just to save more of these metal spheres, and you? Your wearing her creation, the last thing she left behind after she died, and like her, you became a agent...the fucking irony it has...
Ali: well now its over, they think they have the "authority" to take this away from me so i screwed their ass and left and now your dead, theres nothing left for us now
Reverse: not exactly
Ali: what did you do.
Reverse: lol
Ali: what did you do?
Reverse: back in space when i was doing solo missions, i found a giant badass train and qanted to experiment on it, soooooo~ i make each cargo represent my elements and especially my up coming 1, tho side affects are they will each show a individual worsed memory and make them relive it
Ali: and this is relates to?
Reverse: i haven't activate that thing yet, i just made it for fun but sooner or later someone else will and their going to use for basicly destruction and thats when our 2 organization comes in
Ali: i don't like where this is going
Reverse: once the train is activated, it will caught the attention of them and they will work together to stop it and they'll have to begged you to come and help them!
Ali: and i should care bcz why?
Reverse: bcccccz! My body will remain in that ship! Once i got a new body and return here, the body will lay unconciously there in the train but it will stay as a empty sell without my power watch, i already handed it to Banes so no worries there but also, this means i need you to guide those dumbass to the right way, and once your at the core, you'll know where my body is
Ali: thats the most fucked up plan to revived yourself ever
Reverse: i know- uh?
Ali: you better come back soon asshole.
Reverse: hahahahah don't worry kid, i will...

As the memory ends with the young Ali hugging Reverse, everything turns back to normal

Ali: satisfied?
Mechamato: so you knew. . . . . . .