If you have a Koffing already on your bench, you can pull your Weezing back, put the Koffing into play, evolve it, and have another defensive wall to protect your Dragonite. As for Mythical Island ...

Pokemon TCG Pocket has a lot of cards for you to discover, and regardless of your play style and your type ... and with the right cards in your hand, Dragonite and Weezing can take you to victory ...