I know this is a ridiculous question. But where in the rule book is there the rule of 3? I was looking through it and could not find it. Also, since I have come back from not playing for many years, I have noticed it is easy(through the use of some specific powers) to reach the rule of three limit. Does it apply to characters when they use a special power to get there. Example, Venom Pump Bane and then perplex him.

Just wondering, sorry for asking an obvious question, just want the confidence when talking about it.

2011 Core Rulebook Page 6:

Yes, this applies for the value no matter the source. So if a combat value is increased +2 from a non-Perplex source, increasing it +2 more via Perplex will only result in +3.

Damage Value is governed by the Rule of Three.

Damage Dealt on the other hand is not subject to that. Is this correct?

That is correct. Only Combat Values are governed by the Rule of 3. It's rare to find anything in the game that affects Damage Dealt. I only remember the Soda Machine.

Also, the rule is a change of 3 to a combat value when all is said and done, so if your opponent perplexes down your defense by 2, and you perplex it up by 5 you will get a +3 (5-2).

I asked because Non looks like he could be pretty beastly with the right back up.

Indeed, increase his damage value by +1 via perplex, hand him a heavy object and he will do deal 8 damage(barring reducers). If the same target were hit by the son of darksied supes then he will deal 9. If he's using the soda machine that would be 10, crits for 11.