Can I play "Acerola" to return a damaged Pokemon and all cards attached to it to my hand when Lunatone's "Heal Block" ability is activated?
Yes, you can return the Pokemon and attached cards to your hand.
Heal BlockAcerola




x2Heal Block
If you have Solrock in play, Pokémon (both yours and your opponent's) can't be healed.

Lunar BlastCan I play "Acerola" to return a damaged Pokemon and all cards attached to it to my hand when Lunatone's "Heal Block" ability is activated?
Yes, you can return the Pokemon and attached cards to your hand.
If I have a Solrock in play so that Lunatone's "Heal Block" ability is activated, does it apply to all Pokemon in play or just the two active Pokemon?
It applies to all Pokemon in play.
If I have Bronzong with the "Heal Block" Ability in play, can Pokemon Center stadium be used to heal any Pokemon in play?
No, you may not.