Ruling LV67 DP Palkia Question

[bluekirby2000]

DP Palkia LV67's Transback attack says "You may flip a coin." Does that mean that that you don't have to filp a coin if you don't want to? Up till now it's been burning through energy almost every time I use it...

 

[Magic Umbreon]

No, but if not nothing else happens, just damage.

 

[bluekirby2000]

Thanks