In Japanese

[zax1998]

if you take the word pikachu slit it to

Pika and

chu

in Japanese pika is a word for something shiny and chu is the word noise for mice like ours is squeak

http://img.pokemondb.net/artwork/pikachu.jpg

[SERIOUSLY THOUGH]

So when you find a shiny Pikachu you find a pika-Pikachu ?

[Raven]

More random trivia:
In Japanese, rai can mean next, lightning, or thunder.
Also, Pikachu is one of the only (may be the only) pokemon who's name is the same in every language.

[zax1998]

also chimchar in Japanese is houkazerlu (h-or-oo-ka-zeh-rlu) zerlu is monkey in English and houka is arsonist