That depends on what character you use. Generally though, the way to beat dash punch spam is to just duck and uppercut. To beat ground pound, you need either a fast special or you can always just jump to avoid it.
All Raiden's combos are blockable so I have no idea what you are talking about. If you are talking about B3,1,2 spam, you can just press d3 or d1 to try to poke out of it. If you are talking about 3,3,4, you can interrupt Raiden between the 3 and 4 with either a fast special or a fast uppercut.
To stop the flying attack, you need to just block. Once you block, you can get a full combo as a punish.