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With Pop a Wheelie, the 2nd attack isn't from the same bot that attacked the turn the card was played, correct? I would need to have another untapped motorcycle make the 2nd attack?

Correct. If you have another untapped motorcycle on your team, you can attack again. However, note that the first attacker does not have to be a motorcycle.
Source: Wizards of the Coast (2019-07-12)    【Link to Ruling】
Tags: Pop a Wheelie, Attacking