I memorized the type chart. All one needs to know to play Pokemon is basically there. Though some strategy can be useful. Like equiping a Pokemon with a Persim Berry before battling Phoebe. It's odd how so many moves don't work well in game (Trick, Focus Punch, Substitute, Spikes, Belly Drum, etc.), but are amazing in Link Battles, NetBattle, the Game Cube games, and the Battle Frontier.