Nintendo Game Boy Color emulator
By James Grahame
GBCemu lets you play Game Boy color games on a PC. Just remember that downloading ROM images is illegal, OK?
Apparently, "TGB is the first and only Gameboy Color emulator that supports / simulates / emulates gb link cable that enables you to connect 2 roms on one PC or over the IP network and trade pokemons from one emulator game to another or play gb and gbc multiplayer roms."