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.
Source: TPCi Rules Team (2022-06-09)
On my last turn, I attacked with Zebstrika's "Coordinated Bolt" attack. If I use a different Zebstrika's "Coordinated Bolt" this turn, will it do extra damage?
Yes, that would work.
Source: Chilling Reign FAQ; TPCi Rules Team (2021-06-17)
On my last turn, I attacked with Blitzle's "Thunder Spear" attack. If I evolve it into Zebstrika this turn and use "Coordinated Bolt", will it do extra damage?
Yes, Zebstrika is not the Pokemon that attacked last turn; Blitzle was your other Rapid Strike Pokemon that used an attack on the previous turn.
Source: Chilling Reign FAQ; TPCi Rules Team (2021-06-17)