For Swoobat's "Returning Echo" attack, if it is my only Pokemon in play do I have to flip a coin for the attack?
Yes, and if you get tails your Swoobat will leave play and you will have no Pokemon remaining on the field.
Returning Echo



x2
-20
Wave AmplificationDuring your next turn, this Pokémon's Returning Echo attack does 60 more damage (before applying Weakness and Resistance).
Returning EchoFlip a coin. If tails, return this Pokémon and all cards attached to it to your hand.
For Swoobat's "Returning Echo" attack, if it is my only Pokemon in play do I have to flip a coin for the attack?
Yes, and if you get tails your Swoobat will leave play and you will have no Pokemon remaining on the field.