What happens if this Digimon is affected by an effect that forces an attack?
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Official Ruling
This Digimon can't attack players, so it will attack one of your opponent's Digimon.The attack won't be performed in cases where your opponent doesn't have any Digimon that can be attack targets, such as when your opponent doesn't have any suspended Digimon.
Source: BT11-037 Kotemon