Ruling pokemon tournaments

[Pokemon-Striker]

can I still use energy like for example if the modified format only allows ex deoxy set, can I still use energy cards set from ruby and saphire

 

[migdolas]

and how abaut the energys?

 

[StealthAngel667]

Basic energies have no set symbol on them (at least most don't) and their effect will always be the same, so you can use any set's energy.