Let's use Infinity War/Endgame Iron Man here, but he can summon the Hulkbuster Armor if needed. Standard arena rules apply. Setting is downtown Tokyo. The Rangers do not get their mecha.
1. Who's the most powerful single ranger/hero that he can beat in 1 on 1? (extra heroes and rangers are allowed)
2. Which main teams does he defeat? (6th rangers allowed but no extra rangers or heroes)
Bonus:
Same matchups, but with the Power Rangers instead.