When Marshamallon is face-down, and it is flipped by an attack, it has an effect that activates to deal the attacking player 1000 damage. This is a trigger, and Divine Wrath can be chained to it.
However if Marshmallon was flipped on a previous turn, then Divine Wrath cannot be used against his 'cannot be destroyed by battle' because it is continuous and does not activate.
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You can find "Marshmallon" in the booster pack Duelist Pack Yugi.
Yes, you can do this. When Divine Wrath resolves and tries to destroy Thought Ruler Archfiend, you can pay 500 LP and destroy Telekinetic Shocker's effect instead.
Yes, Skill Drain negates both effects of Marshmallon if it was attacked while face-down in Yu-Gi-Oh. The trap card's continuous effects apply during the damage step and cause Marshmallon to be destroyed by battle.
Yes, both effects will be negated.
Forbidden Chalice will negate Marshamallon's 'cannot be destroyed by battle' effect. Because Forbidden Chalice changes the ATK of a monster, it can be used in the Damage Step, after Marshmallon is flipped by an attack. If you did this, you will not take the 1000 damage from Marshmallon either - his damage dealing effect activates after Damage Calculation, but will be negated.