It's a glitch within Pokemon Soul Silver(it may be in Heart Gold too but I can't confirm it since I don't have that version of the game).

Spiky-Ear Pichu is a gift given out to movie-goers who bought tickets to see the Pokemon Arceus movie. But its sprite data, as with other promo Pokemon, is already hidden inside the game. And this glitch lets you see the sprite.

Here's what happened. I participated in the Pokethlon Technique course with a regular Pichu, and I won. Pichu gets a Technique medal. In the 'Shinrai' room of the Pokethlon Museum(2nd room), all the medals you earned with the different species of Pokemon are recorded there. Strangely enough, the Pichu sprite in that room was not a regular Pichu, but the Spiky-eared variant. I'll take a picture of it when I get my digital camera.



I never owned a spiky-eared Pichu and probably never will, but it's still quite a fun glitch.

Not, I'm not taking pictures of my games, but everything else related to Pokemon. I have a small collection of trading cards, figurines and stuff. Okay, my trading card collection is huge. But I won't be scanning all of them. Been collecting for nearly ten years now, and although I've slowed down, I don't plan to stop yet. The only things I collect now are the occasional booster packs, movie promos and other rare cards(boosters are quite expensive). Most of them I got off eBay for quite a reasonable price.

The two on the left are ancient things, the Southern Islands folder collection with 18 cards and the Pikachu World Collection, with 9 different Pikachu cards in 9 different languages. I keep all my promo cards in that Southern Island folder, actually. Got around 50 of them. The big Pokemon portrait in the middle is what I got from a trip. All the pieces are transparent, which is very cool looking if you hold it up against a window. Plus all the cute Pokemon are in it The folder on the right is the 10th Movie Anniversary card collection, with promos of the legendary Pokemon from the Pokemon movies from Mewtwo to Darkrai. Not pictured is the 11th movie card folder.

See that red colored box on the right? That's where I keep all my cards. And the two blue files on top of it? That's all my holographic cards. Last I counted there were about 400.

A select few of my good cards. Six Lv. Xs, some recent promos, and three [your name here] legendary cards from a nine card set. I regret not buying the whole set, but these three are good enough.

And here's my collection of small figurines. They're from my local Toys R Us. I'm sure you guys have got it better than me when it comes to availability of toys like these, but these are the only ones I have. I plan to buy more as they bring new shipments in. The Chikorita is a mini plush doll, and the Pikachu is a sun-powered bobblehead. Quite possibly the cutest one I've seen thus far XD

And finally, my big Manaphy plush doll AA battery to scale.

http://www.youtube.com/watch?v=C8iB4_Hf_5c

Wahahahahaha

Full comboed one of the hardest songs in this rhythm game. And yes, my Wii can play imports.