First Pikachu Im covering is the HGSS promo (Pikachu HS Promo HGSS03)
In some instances, they may be required to flip a coin to see if the attack lands, however
Then, you can proceed forward with these other ace Pokemon (the second Snorlax, which should now be set up with Energy, and Giratina waiting on the bench in case Snorlax gets knocked out)
Once Bloodline Bidding starts to resolve, players can't respond to the choice or take any actions until Bloodline Bidding finishes resolving
You can be sure Muldrotha, the Gravetide is both getting a deck of its own and going elsewhere, but for the most part, its only one copy of a new card for me
As for the leak itself, all signs point to The Pokmon Company simply announcing the expansion in the coming days and not commenting on this odd slip-up