Ok, here's how it works:
You know how certain types are effective against each other, so that's the point of this game. You name a pokemon, and the next player names a pokemon that has a type that can beat it. For example:
Person 1: Piplup
Person 2: Turtwig
Person 3: Chimchar
And so on.
Double types work too. Just use one of the two types to defeat a pokemon, and pick one of the types to defeat.
I'll start.
Mightyena
Ow! Ow! Ow!!! Watch where you're goin'! You just hit Maple, the Great Witch Syrup's apprentice!