Game Empire San Diego, 7052 Miramar Rd. July 4th. $5. The Pokemon TCG League Challenge at Game Empire on the Fourth of July — the competitive tournament for the San Diego scene on the holiday weekend, for the players who know that Championship Points don't take holidays. A League Challenge is where the practice becomes a record. The format is structured enough that your results mean something — better than kitchen table, better than ranked online, enough opposition to reveal where your list still has holes and where the matchup theory you've been working holds. The July 4th edition draws the players who are serious enough to show up when …