The same one I started with when I got yellow. Special Pikachu. Now I'm craving a hunt for the N64 game "Hey you Pikachu!"
OOH STORY TIME.
So, I was at Stuff (a used electronics store owned by a friend), and browsing through their games, when I overheard the owner ask another person who worked there, "Hey do you know what this microphone for the nintendo 64 is for?" I whirled around and answered that it was for
Hey You, Pikachu!; you use the microphone to "talk" to the Pikachu. I then asked if they had a copy of the game to go with it. They went to the back room and pulled it out, and looked up the price for the game with accessories. It was selling online for $25. I walked out with it for $15.
When I was about 9 or 10, my sister and I rented a copy of Hey You, Pikachu! for a week, and had a lot of fun with it. Afterwords, my sister became obsessed with getting a copy of her own, but never was one for saving up. By the time she had the money for it, it was impossible to find in stores.
After leaving the store, I jumped and my bike and hurried 25 miles as fast as I could to give my sister the gift that's been at the top of her list for the last 8 years. I felt proud of myself. :>