What's the point of Congress or the SC if you can do everything through Executive Order?

To keep the president 'in check.'

Ask the obamy.  

Trump uses executive orders as if he's King Donald.  It's so hypocritical.  In 2012, Trump had tweeted: “Why Is @BarackObama constantly issuing executive orders that are major power grabs of authority?”

Trump turned that on its ear and is now taking advantage of the presidency like no other president should, not just with his E.O's, but pardoning his friends, nepotism, and using his position to benefiting his own business.  He's like a friend you invite to visit who overstays the welcome, invites his own family in, and keeps robbing you.

EOs can be challenged by Congress and the SC can rule it unconstitutional etc. If you're interested, learn about it ... quite interesting. The more a president uses EO the more he looks like a dictator attacking democracy.

What's the point of the congress if the SC can just make new laws through interpretation. The people in the system have gone corrupt. 

good question

supreme court can **** the president up though if the order is unconstitutional 

It has its function and not everything is.

Congress can override EO's with legislation