Amazing Yveltal didn't work against Flying Pikachu VMAX

When I attacked with Amazing Rare Yveltal into my opponents Flying Pikachu VMAX the attack didn't OHKO the opponent. Flying Pikachu VMAX's attack states "During your opponent's next turn, prevent all damage done to this Pokemon by attacks from Basic Pokemon." but Amazing Yveltal's attack isn't doing any damage, it's an effect. Pikachu's attack doesn't mention anything about effects so it should go through, but the game is bugged so it didn't count. Before you ask, no, the opponent didn't have a Big Parasol attached to it