Actually I take it back, 3 jabs into EX fireball is really good. You can beat pretty much any button with crMP as long as you keep the string tight, it will whiff if they don't press anything, even if they're crouching, and you can still counterDI if they try to bust out
You can also DP them if they jump back or crosscut if they jump forward

The only problem is that on fat characters like Gief or Marisa this might not work since their hurtboxes are pretty big while crouching

Actually I take it back, 3 jabs into EX fireball is really good. You can beat pretty much any button with crMP as long as you keep the string tight, it will whiff if they don't press anything, even if they're crouching, and you can still counterDI if they try to bust out
You can also DP them if they jump back or crosscut if they jump forward

The only problem is that on fat characters like Gief or Marisa this might not work since their hurtboxes are pretty big while crouching

Actually I take it back, 3 jabs into EX fireball is really good. You can beat pretty much any button with crMP as long as you keep the string tight, it will whiff if they don't press anything, even if they're crouching, and you can still counterDI if they try to bust out
You can also DP them if they jump back or crosscut if they jump forward

The only problem is that on fat characters like Gief or Marisa this might not work since their hurtboxes are pretty big while crouching

Actually I take it back, 3 jabs into EX fireball is really good. You can beat pretty much any button with crMP as long as you keep the string tight, it will whiff if they don't press anything, even if they're crouching, and you can still counterDI if they try to bust out
You can also DP them if they jump back or crosscut if they jump forward

The only problem is that on fat characters like Gief or Marisa this might not work since their hurtboxes are pretty big while crouching

Actually I take it back, 3 jabs into EX fireball is really good. You can beat pretty much any button with crMP as long as you keep the string tight, it will whiff if they don't press anything, even if they're crouching, and you can still counterDI if they try to bust out
You can also DP them if they jump back or crosscut if they jump forward

The only problem is that on fat characters like Gief or Marisa this might not work since their hurtboxes are pretty big while crouching