Who is the strongest S1/2 rookie?

[Wisemon]

Yes, but Armadillomon still couldn't have much of a chance against the flying opponents

Like I said, he'd have to use the right strategy. Half of his flying opponents aren't too quick on takeoff (Biyomon and Patamon). If he can close the distance quickly, he can cream them as they're rising. Hawkmon is a little faster in the air, but he can't use his Hawk Beam unless he's standing. He can swoop to attack with his beak, but Armadillomon would make him pay if he did. That leaves Tentomon, who can use his Super Shocker from the air. If Armadillomon stays curled, he can resist the Super Shocker. Knowing Tentomon, he'd get bored of his attack doing zero damage pretty quickly, and he'd probably give up, realizing that he wouldn't stand a chance in close range.