If it's Peach, charge your down smash while standing over her.
This is so **** i have to start doing this
If you didn't know falcos legs are invulnerable at the start of his downsmash so peach cant do **** against it.
The most common thing i do when i know people are gonna get up attack is double jump fast and fastfall a dair into them to start the combo going again (covers the above position). This stopped working when i started playing decent players who rarely getup attack, but it works great against my friends who do it instinctively.
If youre already above them and think theyre gonna getup attack you to get you away, you can airdodge next to them to dodge it and utilt/shine them to combo them again.
If i'm far away from them on the side and i just finished my combo i try to laser reset them, which is the best thing in the game. If you're close to them and at low/mid percent you should probably cc it, you can jab reset them too if theyre waiting too long for you, or stay in your shield.
From below getup attack shouldnt really hit you?... I like to pressure people on platforms with shorthopped uairs, you can shine waveland to pressure them too and the shine generally hits before getup attack because its a 1 frame move.
If you're having trouble with getup attack and don't want to challenge it, remember that you have a gun, and guns generally force them to roll away from you, which leads to more pew pew for you.
This is especially useful if youre at a high % and want to play safely.