This is the self-referencing rule. δ Ludicolo is refering to itself. If it was refering to multiple Ludicolo, it would specify "30 more damage for each Ludicolo you have in play." Knock Off does 60 damage and Fire Punch does 90 damage.
Ever heard of STACKABLE powers? Like Gyrados or Feraligatr δs? Yep, it probably will be stupid if you did 150 with 3 energies, but who knows? Go read the compodium to see more "stupid" questions. The officials are less annoying as you. Like I said to the other guy, do this again and someone will report you.