hover over a type to see its strengths and weaknesses. if it's connected to a red line, that means its weak against the other type. if it's a green line, that means its strong. if it's a black line, that means its immune. when the type itself changes color, that means that its strong/weak towards itself when atk/def. you can drag the types around.
Pokémon SPACE TO SWITCH BETWEEN ATTACKING AND DEFENDING STATS score = # of strengths - # of weaks (any "nothings" don't do anything)