By Colette Bennett How Pikachu and friends can make you money. When it comes to what you consider worthy of investing your money in, it’s unlikely that you’d consider your son’s Pokémon cards to be a potential goldmine. After all, the brightly-colored trading cards have been around since 1996 and seem to be strictly the domain of young kids, who create decks with them to participate in games against other players. It’s known as a trading card game (TCG), so players also frequently trade with others in hopes of improving their decks and beating more opponents. But the truth is that many adults …