Climax of the game isn't defeating the Elite Four (you get a false ending), it's the final confrontation with Mewtwo
I have not been the first person to bemoan the lack of any non-bildungsroman Pokémon games but honestly I really do wish we could have a Pokémon game that had a little more of that wild, hyperactive SNES energy
All the scientists, thieves and squatters you battle tell you that somebody mysteriously came for the pertinent data over a decade ago
When he sees them, he looks like he’s seen a ghost
They tell Blaine their name and Fuji suddenly storms off, explosively apoplectic
After you defeat him he goes on a weird, rambling tangent about the peculiarity and impermanence of existence & leaves
She tells them she’s in trouble and they need to come back immediately
When they come home they find her—and her entire hulked-out Pokémon collection—in a full-on standoff with the police
And so now Delia Ketchum is under arrest for crimes against humanity and manufacturing biological weapons in defiance of international law
The whole yoke of the Mewtwo Project having been put around her neck
Ash/Leaf fights through a few cops themselves, in an attempt to fight through to their mother
But Gary ambushes them in the battle, having returned to aid the cops
Delia’s already heavily-taxed Pokémon squad is easily crushed under their might and then Delia herself is struck and pacified by an Alakazam
In the confusion, a squad of elite Team Rocket operatives swoops in and abducts them from under their noses
Team Rocket are the only allies they have now
They have an operation planned to recover Delia and they want A/L to take point
So they don Rocket apparel and join a surgical strike on central police HQ
When A/L makes it to the detention block, they find every gym leader they've faced thus far, enlisted to guard Delia until she can be transferred to supermax
And all of them says gives some form of guilt-tripping speech along the lines of "we believed in you and supported your journey and this is who you are now? You joined up with Team Rocket?! You'll pay for this!"
When A/L gets through to their mom, Delia's super relieved and happy to see them, but she's also absolutely horrified that things have come to this
But then the Rocket operatives are like "uh, actually this is gonna play out a bit differently" and knock them both out with Poison-types
And there's some creepo Team Rocket scientist who probably appeared somewhere earlier in the game and he's gleefully dictating his research notes about A/L
Long has he lamented that he never had a chance to examine the legendary Ambertwo himself, but he would never have guessed that Dr. Ketchum had produced a viable backup copy
So he cacklingly reveals that they're not really human—they're an unsanctioned clone of a clone of a clone that was designed to interface with an unstoppable Pokémon superweapon
He brings out a Nidorina, and tells Ash/Leaf that the Pokémon is, out of A/L's own vision, looking at a geometric shape projected upon the wall
They must tell him what the Nidorina sees. If they answer incorrectly...
A/L guesses incorrectly and is immediately electrocuted
"Wrong. Again."