Honestly my main form of pressure is with his b124 string.
Generally you want to start off with b124 and complete the string.
But like
@14K said, ermac is methodical. You need to make reads.
After you do b124 you need to recognize what the opponent wants to do. If they want to poke you after b124 with a d1/d3 then you have a few options. You first need to block the string so that the opponent is now - frames. Depending on the character and the poke you can get a punish with standing 2 into 222 full punish. If the opponent has a - frame poke that is not punishable you can still start pressuring again after their poke into block string.
After b124 you can also pressure with a poke of your own. You can d1 / d3 after this string since it is 0 on block (neutral) it is quite fast and the opponent has to block this or they have to armor. If your poke hits then you get to apply pressure again. Either go back into b124 or another string.
Now after you have conditioned your opponent to the b124 string you can start to stagger the string and go into b12. It is only -2 so you can kind of treat the string like it is neutral and still apply pressure. If the opponent is conditioned to respect b124 then the -2 frames don't even matter really.
From here you can still apply the same concept with b124. You can just expect a poke Andy block it to either get a punish or block the poke and continue to apply pressure.
Or you can start to mix up now after b12. After b12 depending on your reads, you can start to mix in the low and overhead game. If you have a hard read on the opponent blocking low during your strings, then go into b12 stagger F4 into combo.if they block high a lot during your pressure then do b12 stagger into b3 into full combo.
Now if you are not entirely sure on how they are going to be blocking because they mix it up you still have SAFE options. After b12 you can cross up and start all over. If you think they might be blocking low but you are not too sure because they have been adapting then go into b12 instant air overhead. It hits as an overhead. On hit you are + frames and can continue pressure. On block you are roughly +1-2. So you can still do a poke after or go into a string. The same applies for going low. If you are not sure how they will block and they adapt then do b12 stagger into d3. On hit you are + frames and more then enough to even 50/50 if you want or just keep applying pressure.mon block you are -6. You are always able to do b12 grab as well. Doing this will make your opponent try to tech a grab and eventually you can do b12 into a string to punish grab techs.
So all this time using b124 string, you are applying pressure and conditioning your opponent. Conditioning the opponent like this makes it a lot easier to get reads and land a F4 or B3. A lot of players I see right now just go right into F4 or B3 with little to no conditioning. But if you condition the opponent you turn a coin flip into a 100% read and get a hit instead of taking a risk.
