Shai Hulud
Smash Lord
Chances are this is known by SOMEONE but if not then I present to you the tap reset chaingrab. Some variation of this should work on almost every character, but I haven't been able to test it out on many so at this point the timing is unknown.
1. Grab
2. Downthrow
3. As soon as Popo starts the downthrow, jab, then jab again (the second part, not IASA cancelled) with Nana
4. Regrab
Repeat until you're tired of it. This is a pseudoinfinite (0 to death but maybe not 0 to 999) as far as I can tell. The timing between the two jabs varies somewhat. You want the first jab to hit while still in the throw, and the second to hit as soon your opponent bounces off the ground. This resets your opponent to a stunned animation just off the ground from which you can easily regrab.
So far I can only confirm that this works on a level 1 Peach, but I don't see why it wouldn't work on everyone else.
Edit--can't get a working timing for Fox. I think this will only work on characters for whom the downthrow animation is longer than the double jab animation. Which characters those are, I'm not sure. I'm guessing it's a certain cutoff in the listing of characters by weight:
(1) Bowser
(2) DK
(3) Samus
(4) Ganondorf
(5) Yoshi
(6-7) Captain Falcon / Link
(8-10) Dr. Mario / Luigi / Mario
(11) Ness
(12-14) Peach / Sheik / Zelda
(15) Ice Climbers
(16) Marth
(17-19) Mewtwo / Roy / Young Link
(20-21) Falco / Pikachu
(22) Fox
(23) Kirby
(24-25) Jigglypuff / Mr. Game & Watch
(26) Pichu
From my initial impressions this seems to work on #1 - 19, although they vary somewhat in difficulty.
I do not know what effect DI has on this chaingrab as I haven't been able to test it against humans. Also, I do not know if certain characters can break out by attacking during opening frames. I don't have AR so I'm trying to figure this out without precise data.
1. Grab
2. Downthrow
3. As soon as Popo starts the downthrow, jab, then jab again (the second part, not IASA cancelled) with Nana
4. Regrab
Repeat until you're tired of it. This is a pseudoinfinite (0 to death but maybe not 0 to 999) as far as I can tell. The timing between the two jabs varies somewhat. You want the first jab to hit while still in the throw, and the second to hit as soon your opponent bounces off the ground. This resets your opponent to a stunned animation just off the ground from which you can easily regrab.
So far I can only confirm that this works on a level 1 Peach, but I don't see why it wouldn't work on everyone else.
Edit--can't get a working timing for Fox. I think this will only work on characters for whom the downthrow animation is longer than the double jab animation. Which characters those are, I'm not sure. I'm guessing it's a certain cutoff in the listing of characters by weight:
(1) Bowser
(2) DK
(3) Samus
(4) Ganondorf
(5) Yoshi
(6-7) Captain Falcon / Link
(8-10) Dr. Mario / Luigi / Mario
(11) Ness
(12-14) Peach / Sheik / Zelda
(15) Ice Climbers
(16) Marth
(17-19) Mewtwo / Roy / Young Link
(20-21) Falco / Pikachu
(22) Fox
(23) Kirby
(24-25) Jigglypuff / Mr. Game & Watch
(26) Pichu
From my initial impressions this seems to work on #1 - 19, although they vary somewhat in difficulty.
I do not know what effect DI has on this chaingrab as I haven't been able to test it against humans. Also, I do not know if certain characters can break out by attacking during opening frames. I don't have AR so I'm trying to figure this out without precise data.