Iron Man is given full access to the DC Universe and given unlimited amount of the to create this. Could he create an armor powerful enough to defeat Superman or any kryptonian?
uhm did everyone forget that superman JUST beat a "kryptonian buster" while he was weakened AND under red sun light AND caught off gaurd:
Yes but he'd still lose.
You see Tony's buster armors failed both times, he failed to beat Hulk and he failed to beat Thor with busters specifically tailored to them. Superman is stronger than Thor and Hulk at his base (as for a fully enraged Hulk it's up for debate) so yeah Tony gets killed.
Yep. He'll add Kryptonite, red sun radiation and what not. iirc reed copied sentry's light, so tony, with all resources could possibly do the same.
But as in go against him one on one directly? Lol no, he's way out of tony's league. And with his record in building 'buster armors'..