What's so special about Ash's Pikachu?

[Blaziryu]

Ash's Pikachu is special since it can hurt Ground-types with its Electric-type attacks. Plus, its king of the Pikachus in that forest area back in Kanto.

[pokemonsquared]

It's the only pikachu that can both OHKO regice and lose to a snivy.

[MewOneTwo]

Wow, Ash's Pikachu is very very very special. Why? This is my reason.
    Spoiler:

Show Spoiler

 
I watched the most recent episode of Pokemon Best Wishes 2 episode 13: Advance of Therian Formes! Unova's Greatest Crisis! just aired in Japan a few days ago.

In this episode, Giovanni and Team Rocket capture Meloetta and use her to summon three legendary Pokemon. There is a raging battle between the legendary Pokemon and other Pokemon from Ash and his gang's side. In one scene, Pikachu uses thunderbolt gallantly to protect Dragonite against an attack by one legendary Pokemon. Pikachu absorbs some energy from the attack. Next, at the top of a tower, Ash tells Pikachu to use Electro Ball against Giovanni to help release Meloetta.

Oh wow! you should watch that part where Pikachu builds a super gigantic Electro Ball and launches it at Giovanni, Team Rocket and the evil professor. That is awefully explosive. The Electro Ball is as big as the one where Goku in Dragon Ball Z makes and tosses it at Frieza.
I know Pikachu uses his absorbed energy to power up the ball so big. He is truly special.
 

I recommend that you watch that episode.

[Dane12]

The only pikachu that ever went fat
and was weaker than an untrained grass type starter

[pacman000]

When Team Rocket first appeared, they battled Pikachu. Meowth tried to battle him, but lost. Pikachu is a mouse; Meowth is a cat. To save face, Meowth told Team Rocket that Pikachu is unusually strong. Jesse and James went along with it, because Meowth was their boss.

[Fire Hero]

He's special because he's the main star of the show. Period.

But well, it's a Pikachu that can beat legendaries like Registeel and almost lose against weak stuff like Tynamo (that was a "technical" loss, he was humiliated).

[Papousse]

It's the only pikachu that can both OHKO regice and lose to a snivy.

That's so true
But he was weakened, his eletric power has gone !

[pokemonpokemon]

Ash's Pikachu is really special. I remember that way back in season 1 there is an episode, called Goodbye Pikachu. In the episode, there is a whole bunch of Pikachu. But, I was able to identify exactly which one was Ash's. When I see pictures of Pikachu online, my senses tell me which Pikachu is Ash's and which one is not.

[pokemonpokemon]

Ash's Pikachu is special because he is the only Pokemon in every single episode from season 1 to now.

[lovelyteddy]

Ash's Pikachu is different than all other pokemon in the entire Goldfish Bowl. Pikachu is wildly popular with people in general, and has caused people to think that the particular species of Pokemon, Pikachu, is actually good! ChaCha on!

[GoggleBoy]

It's the only Pikachu with a power level of over 9000.

[drmkwk]

well if you notice at the start of each new generation pikachu always discharges all its electricity. I think thats how it resets its own power level.

[Fluffyy]

Ooh this is just a rumour but Red might be Ash's older brother, you can see the resemblance between the both of them. Anyways, as Red started his adventures beating team rocket and going up Mt. Silver. Technically Ash looked up to Red, and wanted to be the very best trainer. Red knew Ash was turning 10 so knowing Ash was going to be late, he sent his OVERPOWERED Pikachu to Professor Oak. And so on if you seen the anime, this may be the reason for Pikachu disliking Ash at the start of the anime.

[Blaziryu]

Ash's Pikachu is special because it can put aura power into its electric attacks which inflicts damage to any type of Pokemon.

[TheBattleFrontierAsh1]

He's the only Electric type able to hit ground types back in the OS.

[silverangel]

Ash's Pikachu? Heck, does it even have a light ball?

[fitzy909]

I guess being able to hit ground types with electric type attacks is pretty special and it's fairly strong. But really, if team rocket tried to steal other pokemon and not follow ash just to get ptkachu then they'd have more luck. Really, pikachu is just an above average pikachu with nothing else outstanding about it. Although it does do very good impressions!

[Tamer Hamlet]

There is absolutely nothing special at all about ash's/Satoshi's Pikachu, o__o why would you consider the Gym Battle against Brock Onix and Ash Pikachu a win or even a battle e.e the whole thing was a fluke, If I were Brock I would of asked for a re match since using the sprinklers against onix was a cheap and dirty trick and by no means a fair battle.

e.e how is it that Onix being a rock type even with the sprinkles soaking Onix wet make any damage to Onix its a darn Rock type...Point is Ash's Pikachu and sometimes e.e not all the time ash pulls unfair and dirty tricks such as what happened with Onix, even Raichu and Magmar almost killed it.

another Fluke of a battle e.e Pikachu vs Rhydon.

Not to mention lol Team Rocket were the weakest Trainers ever.

Edit:

@Affection Ash(ash was second) was based after Trainer Red(Red was first) so in no way are the two related, Ash Pikachu and Red's Pikachu are totally different Pokemons. Same goes for Gary which was based also after Green from the Pokemon Red and Blue Gameboy Games.

[Elysian]

Pikachu's hacked. Duuh

[FinalSynFrey]

The bond between Ash and Pikachu.