Unown

Larvitar liked traveling with Ash; he saw Ash as his father. So far he didn't like Misty and Brock because he was scared of them; it was only Ash, Tomo and Growlithe that he wasn't afraid of. While on the way to the Pokemon preserve Larvitar had met many different Pokemon and found out what adventures were like. Along the way, Brock's Pineco evolved into a Forretress. The gang also reunited with their old friend Casey. They found out her Bayleef was now a Meganium, her Flaffy was now a Ampharos and she had captured her own Elekid, so Casey was happy. For a baby Pokemon Larvitar was quite strong. Aside from knowing Hidden Power and Screech, he also knew Dig, Bite and Ancient Power. Ash could tell that Larvitar would grow up to be a very strong Pokemon in the future.
Now the gang was walking up a mountain area, but then Ash suddenly stopped in his tracks.
"I sense an Unown." He said. 
He and the others looked up to the sky and then a purple light glowed in the sky and then an Unown, in the shape of the letter G, appeared and landed on the ground.
"Whoa, it's been a while since we saw Unown." Ash said.
"You're right." Brock said.
The gang remembered meeting Unown in Greenfield, and that was months ago. Ash touched the Unown. 
"It feels sick and it feels sad after being separated from the other Unown in it's dimension." Ash said after reading Unown's mind.
Ash looked it up on the Pokedex.
"Unown, the Symbol Pokemon. Their shapes look like hieroglyphs on ancient tablets. It is said that the two are somewhat related."
As there was no Pokemon Center nearby, the gang took care of Unown themselves. Unown was now sleeping in a bed, with a wet flannel on it's forehead. Larvitar and Growlithe watched over it. 
"Unown will probably make it's way back to it's dimension once it's better again." Ash said. "Remember Unown have the ability to cross between dimensions."
Ash remembered all the abilities Unown had; like crossing between dimensions, making strong psychic bonds with humans and making one's mind a reality. Tomo, Misty and Brock remembered Unown's ability as well. Ash was also having Larvitar keep a eye on Unown. 
"It's good to see that Larvitar is starting to look up to other Pokemon." Misty said.
"Yes, even though it's still shy around humans." Brock said. 
"You know, ever since we got Larvitar I have been wondering." Ash said. "I wonder what happened when Larvitar was stolen from the Pokemon preserve. And I also hate to think what the poachers are like and I do hope Larvitar's mother is okay." 
"I've been wondering about that too." Brock said. "And I have the feeling must be really bad, and there's no doubt that Larvitar's mother is really worried about her child."
"All the more reason for us to take Larvitar back to the preserve." Tomo said.
"I agree and we should start heading over there first thing in the morning." Misty said.
Everyone else agreed with that plan.
The next morning Unown was feeling well again, relieving the gang. Larvitar was the happiest of all and began talking to the Unown. Just then Unown touched Larvitar's head and then it began to glow.
"Hey, what's going on?" Misty asked.
Before Misty's question could be answered the Unown glowed really bright and then everyone disappeared.
Ash woke up in a strange area; there were broken green egg shells everywhere. He, Misty, Tomo and Brock were floating on top of egg shells. But Growlithe, Togepi and Larvitar were not with them.
"Where are we?" Tomo asked. 
"I think we're in a different dimension." Ash said. "I mean, Unown glowed very bright when it touched Larvitar and it must have teleported us to this dimension. The only question is, what dimension is this?"
Suddenly Flaaffy, Growlithe and Togepi turned up and they were humongous.
"Where's Larvitar?" Ash asked. 
Larvitar was nowhere to be seen.
The gang started to search for Larvitar; Ash and Brock rode on Flaaffy, Tomo rode on Growlithe and Misty rode on Togepi. Suddenly the area changed into another area; the area was now filled with Elekid heads and the Electabuzz team theme song was heard. Then the gang started seeing images of the adventures they were recently in and they ended up back where they started.
"I have a feeling Unown is behind all this; I mean, we went through something like this with the Unown last time remember?" Ash said.
Brock, Misty and Tomo did remember that. Just then they saw an enormous green egg with cracks and a black thorn on the side of it. 
"This is Larvitar's egg." Ash said.
He looked through one of the cracks and saw an image of himself. Tomo, Misty and Brock saw images of themselves too, but Brock and Misty were in black and white. 
"I think this is how Larvitar sees us through his eyes." Brock said. "Which means we must in the mind of Larvitar. I mean, all those things we saw were memories of Larvitar."
"It makes sense." Ash said. "I mean, Unown touched Larvitar's mind when it glowed so now Unown is showing us Larvitar's mind. Remember we went through something like this when the Unown merged with Molly Hale's mind." 
The others remembered that. Ash went to see what the black thorn was, but as soon as he touched it, the thorn sucked him in. Tomo, Misty, Brock and the Pokemon tried to help him, but they were sucked into the thorn too.
The gang was now in another area but now Flaaffy, Togepi and Growlithe were back to normal size. 
"Okay, so what's this area about?" Tomo asked.
Then an enormous machine appeared out of nowhere and a web net came out of the machine and surrounded the area.
"What's going on?" Ash demanded.
Just then the gang heard a voice saying; "I'm scared."
"That voice." Ash said. "I think it's Larvitar's, but it sounds scared."
Just then the machine grabbed an egg and then the gang saw three men holding the egg.
"Who on earth are they?" Misty asked.
"If I'm not mistaken." Brock said. "I think this is Larvitar's memory of the day he was stolen from the Pokemon preserve as an egg. And those three men are the no good poachers who stole him."
Suddenly a Tyranitar appeared.
"Mommy!" Larvitar called out.
"That must be Larvitar's mother!" Misty gasped.
Just then Tyranitar was struck by some blasts.
"Hey stop that!" Tomo shouted.
Tyranitar was injured by the blasts and received a scar on her chest, then she started to disappear from sight while Larvitar was still calling out "mommy". 
"It's because of that forced separation from it's mother is the reason Larvitar is afraid of humans." Brock said angrily.
"If I ever encounter those poachers, there's going to be hell to pay." Ash said angrily.
Just then the memory faded and Larvitar appeared, but he was surrounded by black thorn patches. Brock explained that the black thorns represented Larvitar's awful memories and poor Larvitar was still petrified by them.
"With all the horrible things it went through, it's no wonder Larvitar is afraid." Misty said.
Ash could see that Larvitar was trying to fight back against the horrible memories because Larvitar was struggling to free himself from the thorns. Ash ran up the hill of thorns to help Larvitar and the others followed. It wasn't easy trying to get to Larvitar because the thorny branches kept trying to stop them. And then Larvitar got covered by a block of ice. Ash ran up to the ice and punched it to try and free Larvitar.
"Larvitar, don't give into those painful memories of yours." Ash said. "Remember all the good and fun times we had together."
"That's right, not all humans are bad Larvitar." Brock said.
"Yeah, we aren't bad." Misty said. "And you met some more good people while we traveled together."
"Larvitar!" Tomo called out.
With one final punch, Ash freed Larvitar from the block of ice. When Larvitar opened his eyes and saw Ash, he happily jumped straight into Ash's arms.
At that moment the gang found themselves back at the giant egg and the black thorn disappeared.
"This must mean that Larvitar trusts us." Brock said.
Suddenly the egg began to glow and then the gang was transported out of the dimension and back into the real world and their campsite. The gang was relieved to be back in the real world. The Unown then came into view and it was happy to see everyone again.
"Listen Larvitar." Ash said. "No one is going to hurt you again and we are going to take you back to your mommy."
"That's right." Misty said. "You can count on us."
Larvitar stared at Brock and Misty and instead of hardening up he smiled at them. This meant that Larvitar was no longer afraid of Brock and Misty and now saw them as friends. Ash turned to Unown and thanked it for it's help.
Then a portal to the Unown's dimension opened up in the sky and there were hundreds of Unown searching for their friend. The stray Unown said goodbye to the gang and returned to it's dimension. 
"I find it unbelievable that we have seen the Unown twice here in the Johto Region." Misty said.
"Me too." Tomo said.
"Okay everyone." Brock said. "Now's the time we continue onto Mt. Silver and take Larvitar home."
The gang agreed with Brock.
So with the Unown back in it's dimension and Larvitar free from it's bad memories, the gang continued on towards Mt. Silver to reunite Larvitar with his mother.