It should come as no suprise to you that after a big fad such as Pokemon, Pikachu and gang would eventually wind up on the Famicom. Not only do they appear once, they appear in a whole series of pirated Famicom games.
As it was said before, there were several Pokemon games made for the Famicom. Let see here--Red, Blue, Yellow, Green, Silver, and Gold. It seems like the whole series has been ported remade on the Famicom. The sad truth is that instead of remaking the games, the piraters took several popular Nintendo games and hacked the games with Pokemon characters.
Pokemon Blue is a hack of Wacky Racers, Pokemon Yellow is actually Felix the Cat, and Pokemon Silver is the totally cool Little Nemo game. Yes, these games have been hacked with the Pokemon characters. You don't believe me? Check out the screenshots below.