As long as Skarmory is the only Pokémon you have in play, your opponent's Basic Pokémon can't attack.

Search your deck for a Pokémon (excluding Pokémon-ex), show it to your opponent, and put it into your hand. Shuffle your deck afterward.

During your opponent's next turn, any damage done to Skarmory by attacks is reduced by 20 (after applying Weakness and Resistance).