4 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

What exactly does this card's <When Attacking> effect do?
When this Digimon attacks, no matter what its target is, this effect allows your opponent to choose any of their unsuspended Digimon. If they do, this Digimon is forced to attack it instead.
Ruled Mar 28, 2024
When attacking with this card, am I required to announce the target of attack?
Yes, you are.
Ruled Mar 28, 2024
Can I use this card's <When Attacking> effect to attack my opponent's unsuspended Digimon?
You can't announce that you're attacking an opponent's unsuspended Digimon, but your opponent can force this Digimon to attack one of their unsuspended Digimon if they choose to.
Ruled Mar 28, 2024
My opponent attacks with [BT4-075]/[Blastmon]. If I have an unsuspended Digimon in play, am I forced to switch the target of attack to it?
No, the player who is currently being attacked gets to decide whether or not to switch the target. If they choose not to, the attack proceeds as it was originally declared.
Ruled Mar 28, 2024
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Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.