On my last turn I attacked with Zebstrika's "Coordinated Bolt" attack. If Zebstrika gets KO'd or otherwise leaves play and on my next turn I use Zoroark's "Phantom Transformation" Ability to bring the Zebstrika back onto the Bench, can I use that Zebstrika's "Coordinated Bolt" attack with additional damage.

Yes, you can. Although Zebstrika left play and came back it is considered a different Pokemon on the previous turn.

Relevant cards

SWSH6_51

SWSH7_103