Trainers » Lost City | Abilities » New Moon
If Lost City stadium is in play and Lunatone's "New Moon" Ability is active, what happens if multiple Pokemon including Lunatone & Solrock are KO'd?
All KO's are evaluated simultaneously, so if the New Moon ability was active all KO'd Pokemon would go to the discard pile.
Source: TPCi Rules Team (2023-09-07)
Trainers » Lost City
When Lost City stadium is in play and an evolved Pokemon is knocked out, does the Basic and all of its evolution cards go to the Lost Zone, or only the top evolution card goes into the Lost Zone and the rest of the Pokemon cards go to the discard pile?
Yes, all of the Pokemon in the evolution chain go into the Lost Zone. All other cards are "attached" and are discarded.
Source: TPCi Rules Team (2022-10-13)
Trainers » Lost City | Energy » Splash Energy
What happens if a Pokemon with Splash Energy attached is Knocked Out by an attack while Lost City stadium is in play?
The order of resolution for the effects can be decided by the owner of the Pokemon with Splash Energy attached to it. So the Pokemon can either go to the Lost Zone and stay there, or use Splash Energy to return the Pokemon to your hand.
Source: TPCi Rules Team (2022-09-08)