How does Mewtwo ex's damage change work against Carbink's safeguard ability? I know it removes damage from Mewtwo online w/o adding it to Carbink. But I am not so sure if that applies in physical card games.
The same happens IRL. When you use Damage Change, you remove all damage counters from Mewtwo and move them into Carbink. Carbink only prevents effects and damage done to itself, so it prevents the damage from hitting him; although it doesn't prevent the damage from leaving Mewtwo. And since Carbink is protected by Safeguard, the damage doesn't "bounce back", but gets lost instead.