Welcome to Smogon! Take a moment to read the Introduction to Smogon for a run-down on everything Smogon, and make sure you take some time to read the global rules.
This is a dynamic chart to see how many of 17 types your pokemon are super effective against. Select the type moves from the menu and it'll tell you which your pokemon covers and doesn't.
Download
Don't know if you'll find it useful, you may or may not. Saves quite a lot of remembering in my...