QFor the SP Oshi skill "Ollie Revives" of hBP02-006〈Kureiji Ollie〉, can I bloom holomem with #ID Gen 2 placed this turn, or holomem with #ID Gen 2 that has bloomed this turn?

ANo, the SP Oshi skill "Ollie Revives" of hBP02-006〈Kureiji Ollie〉cannot bloom holomem placed on stage this turn or holomem with #ID Gen 2 that has bloomed this turn.

QFor the Oshi skill "Zombie Tactics" of hBP02-006〈Kureiji Ollie〉, can I bloom holomem with #ID Gen 2 placed this turn, or holomem with #ID Gen 2 that has bloomed this turn?

ANo, the Oshi skill "Zombie Tactics" of hBP02-006〈Kureiji Ollie〉cannot bloom holomem placed on stage this turn or holomem with #ID Gen 2 that has bloomed this turn.

QCan I bloom using a holomem from my archive after the ability of SP Oshi skill "Ollie Revives" of hBP02-006〈Kureiji Ollie〉 has resolved?

ANo, you may only bloom during the resolution of the ability.
As such, you can bloom after drawing 4 cards and discarding 2 cards.

QWhen using the Oshi skill "Zombie Tactics" of hBP02-006〈Kureiji Ollie〉, can I choose the holomem from among the holo Power use to pay for the Oshi skill?

AYes, you can.

QCan I use the SP Oshi skill "Ollie Revives" of hBP02-006〈Kureiji Ollie〉 when my deck has 3 or less cards?

AYes, you can.
In that case, draw cards until the deck has no cards left, and archive 2 cards from your hand.