Darkanine said:
Akron: 1
Tiamat: 0
I was almost expecting Tiamat to stomp with its hax, to be honest. Though, I should probably mention that Akron's BFR hasn't been depicted as that powerful. He BFR'd Matt, Natalie and Lance on the other side of the world, give or take.
Yes, it BFR'd beings of roughly it's power halfway across the planet. Let's call that a quarter the Earth's circumference for simplicity. That's 6225 miles or 10018.17 kilometers. Assuming "Earth" ends at the Karman line, or 100 kilometers, that's one hundred times further than needed for nullification.
Assuming "Earth" ends at the SOI (sphere of influence, or the point where it's gravity is more influential than any other body) of the moon, or 66100 kilometers, Akron would have to repeat this process six and a half times.
Assuming "Earth" ends at the edge of it's SOI, or 924000 kilometers, Akron would have to repeat this process ninety two times.
Assuming "Earth" ends at Akron's pocket dimension, where it'd inevitably retreat to, BFR is null.
Thus, it depends on what the boundary of "Earth" is. Bear in mind this is lowballing Akron's BFR. Tiamat has no method of movement in space, giving Akron as much time as it needs to regain its power and repeat the process.
Now, the reason Akron didn't simply repeat this feat at the end of EBF3 is due to Matt, Natalie and Lance gaining power and awareness of Akron's teleportation. I doubt it'd be able to repeat that on them. Tiamat, on the other hand, has only base intellect, probably not enough to process what Akron did in time.
I believe Akron to be at the least, resistant to mental manipulation, what with it's age, soul manipulation, and the fact that Tiamat's mind manipulation is on a small part of the world.
Furthermore, reading a bit closer into Tiamat's powers, her nullification is "special attack or legend" or attack created in proper human history. Akron holds neither of these titles. Akron is older than mankind, thus none of it's attacks were made in history.
Akron is also old enough and smart enough to know Tiamat's inability to do anything on land. Thus, it's just holding off her minions, gathering it's power, and warping Tiamat into space or Akron's dimension.