The ground beneath them trembled, countless shattered rocks flew... Neither Gary nor Blue had expected Ash's initial capture battle to have such a earth-shattering effect!
And seeing that he not only sent out Pikachu and Kangaskhan but also personally jumped onto the Onix, the two were instantly terrified, almost sending Squirtle and Bulbasaur to assist.
"Don't worry, I haven't started battling Onix yet, I'm going to help it solve its problem first!" Ash said, taking a moment to reassure them.
He discovered another Aura signal inside Onix, knowing that this situation was likely similar to the original story, where another Pokémon had burrowed into Onix's body.
"Indeed... that Onix's expression wasn't fierce, but rather painful." The sharp-eyed Blue also noticed this; Onix seemed to be trying hard to endure something.
"Woo! Woo..." The giant Onix kept shaking its head. It had smashed countless obstructing rocks and finally gradually stopped.
"Alright, it'll be fine soon." Ash also breathed a sigh of relief when he saw this. He jumped off Onix's body and quickly found a Graveler stuck in one of its rock crevices.
"Doesn't hurt now, does it?" After removing the 'foreign object', Ash patted Onix's body and asked.
"Woo~" Onix immediately became cheerful.
From Ash's impression of the original story, this Onix was originally a docile Pokémon, only going berserk when in unbearable pain.
Its body was simply too large, so large that some of its crevices were like small caves, often trapping unsuspecting Pokémon inside~
"Onix, if you're alright, would you like to have a battle?" After Onix had rested, Ash directly proposed a battle. "If I win, how about you become my Pokémon?"
"Woo!" Onix didn't hesitate and readily accepted the challenge.
As the most powerful being on Miyacha Mountain, it certainly wouldn't refuse a battle like some Pokémon, especially since Ash had just helped it, earning its initial recognition.
"Your opponent is it, Pikachu!" Ash waved his hand, and Pikachu immediately jumped spiritedly in front of Onix.
"Using Pikachu... against Onix?" Gary couldn't help but frown worriedly. "Even with Iron Tail, the type matchup is very unfavorable."
"Just watch, maybe Ash is very good at fighting against type disadvantages~" Blue, however, was full of confidence in Ash.
From what she knew of Ash, he wouldn't act rashly without a certain degree of confidence.
"Begin! Pikachu, Quick Attack!" A quick opening attack, Pikachu, taking advantage of the priority move, shot out like an arrow from a bowstring!
"Woo!" Onix let out a low roar, twisting its body and delivering a powerful Tail Whip!
However, Pikachu's mobility was not to be underestimated. With a small jump, it dodged Onix's counterattack, then slammed into its opponent!
Unfortunately, with Onix's defense, the damage from this preemptive strike was not much better than a scratch~
"Its defense is indeed extraordinary... Next, use Iron Tail!"
"Pika!" Receiving Ash's command, Pikachu immediately adjusted its posture, using the inertia of its twist to forcefully lash out its metallic-glowing tail, finally leaving a scratch on Onix!
At the same time, a faint electric arc also transferred to Onix, instantly making its entire body stiffen!
"It's paralyzed!" Gary's eyes lit up. "Continuous close-range attacks, it was to activate its Static ability!"
Ground-type Pokémon are completely immune to Electric-type damage, so even status moves like Thunder Wave won't work, but this doesn't mean they can't be paralyzed at all!
At this moment, Onix's overall speed was not only halved, but it also ran the risk of being unable to use its moves at any time, its combat power already plummeting!
"Pikachu, next, use Tail Whip~"
Facing the slow-moving Onix, Ash directly had Pikachu Taunt it face-to-face, not only successfully lowering the latter's defense but also infuriating Onix into continuous roars.
Even if it wanted to counterattack with Rock Slide, Pikachu would always easily dodge it.
"Woo!" Finally, Onix could no longer suppress its anger and charged at Pikachu with a Take Down... "Grass Knot!" However, what awaited it was a tangle of tripping vines, and its huge body fell directly to the ground!
"Next, use Surf!" The relentless Pikachu stirred up a powerful current, and Onix's entire body was instantly swept away, suffering quadruple super-effective damage for the second time!
"What on earth has this guy... taught Pikachu?" Gary couldn't help but grumble to himself. Was Ash trying to create a yellow mouse that could Dig and fly...? "Magnet Rise into the air!"
Gary:...Watching Pikachu ascend into the air to avoid Onix's counterattack, Gary was speechless.
Bah, disgusting!
He had never seen such a shameless battle!
"Woo!" Onix seemed to know that a rash attack wouldn't be beneficial, so it roared and used Dig, starting to wait for an opportunity underground.
You yellow mouse don't have wings, so you can't just float in the sky forever, can you?
"Is it a stalemate... No!" Just as the two sides were in a standoff, Blue suddenly felt a slight coolness, and raindrops hit her nose.
"Blue, I have an umbrella in my bag. You and Charmander shouldn't get wet." Ash then threw his backpack to Blue.
By the time Blue and the others opened their umbrellas, a heavy rain poured down without warning, and the entire Miyacha Mountain was instantly covered by a thick curtain!
"Woo!" Onix let out a distressed howl, furiously rushing out of its burrow on its own accord.
With such heavy rain, dragging it out would only be detrimental to it!
"The time has come! Pikachu, use Thunderbolt!"
"Pika~!" Terrifying lightning shot up into the sky, even staining the black clouds above with rolling thunder snakes!
"Does he want to use the rain to correct Thunderbolt's accuracy? But in such a short time, Onix might not be completely soaked..." Gary frowned in confusion. Thunderbolt in this state might cause some damage to Onix, but the effect shouldn't be too good.
What on earth is Ash thinking?
Crack!!
Just as Gary was utterly perplexed, a thick bolt of lightning crashed down, but its target was not Onix... but Pikachu, who was holding its tail high in the air!
"That's... Iron Tail? It's using a Steel-type move to attract lightning?!"
In an instant, Gary understood everything!
Paralysis, defense reduction, super-effective strikes, and then the Thunderbolt just now... all of Ash's preparations were for this final blow!
"Pikachu, use Iron Tail with full power!"
"Pika~!!"
Pikachu, glowing with electricity, directly canceled its Magnet Rise state in the air, transforming into a free-falling golden meteor, rushing straight down towards Onix!
"Woo... woo?!" Onix raised its head, wanting to make a final struggle, but the sudden paralysis rendered it powerless, and its entire body instantly froze in place!
At that moment, it could not make any move, only letting Pikachu's Iron Tail sweep across the cross-shaped scar on its face!
Boom!!
Electric arcs burst, and Onix's huge body crashed heavily to the ground, shaking the entire Miyacha Mountain!
"Onix, the battle is decided."
When it finally managed to open its eyes, what it saw was a Poké Ball almost within reach... and the young man with a confident smile on his face~
There is an illustration here, which can be viewed after the updated version.