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ATP-2: ATP-2
Number: 007
Rare
0★
+1
Pierce 1When the upgraded character attacks an enemy with 17 ★ or more 🠪 It gets an additional +2

and
Pierce 2 this battle.
Does this get the trigger against Sky Shadow’s combined form?
Yes, Skyshadow is 17 Stars (14 for the body, 3 for Ominus) and this would trigger against him. Head mode stars are added to alt/body mode stars for ‘multi-component’ characters like Titan Masters per the WotC ruling.
Source: ATP:Alpha Trion Protocols Wave 2 FAQ
What happens if I get the trigger, but my opponent reveals a Sabotaged Armaments?
The Trigger grants the ability to the Character; therefore you would keep +2 Attack and Pierce 2 for that Battle, similar to cards like Kinetic Intensifier Whip.
Source: ATP:Alpha Trion Protocols Wave 2 FAQ