For SDI
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I might get flamed for this, but whatever. Here's what I do, and I have a very good SDI compared to most anyone I know.
- 99 lives, infinity time, Final Destination (don't ever mess with damage ratio- it creates bad habits and unrealistic scenarios)
- 2 Level 9 Lucas (nair/dair), Ivysaur(nair/fair) or Link (jab/usmash) on a team, team attack off (not 3 computers, that's zaniness. 1 computer too infrequent opportunity to practice)
- Don't attack. Just get hit and practice spamming control stick and c-stick in the same direction, different directions, try rotating as you expect the hit, hold c-stick for ASDI but slam control stick for SDI and vice versa, etc.
Do that for a while until you get the timing. An hour a day for 3 days or something. Then switch to...
- 99 lives, infinity time, any stage
- Level 9 computer (I know, I know, but level 3s just aren't fast or smart enough)
- Fight the actual enemy, practicing as you go. Run drills- Lucas, Ivy, Link.
Hot Tips: People have three issues with SDI. Number 1- they don't smash the stick. They hold it, as if it were DI. You gotta smash, bruh. Number 2- If you're at low or medium percentage, you're SDI and anti-combo DIing, not survival DIing. Learn when it's time to swtich. Number 3- The timing is PRECISE. You have to hit smash the stick as you're getting hit, not before, not after. You have a bit of a window, but it's frames. Jam the stick as you get hit. Don't try to be a hero and get 3x or 4x SDI inputs on a 3-frame hitstun window. You ain't a robot, and even M2K can't do that. Get one, be done. Get ready for the next one.
For DI (survival)
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- KNOW HOW DI WORKS. Perpendicular angles, partial DI.
- Play a lot of people and slowly memorize the default direction (angle) moves hit you in. Every time you get hit say, "What direction was perpendicular? Oh, I should have been holding 45 degrees for that ~170 degree, left facing fsmash I just took in the middle of the stage...
I gotta poop otherwise I'd write more but this is tl;dr anyway.