I was doing some personal research on Squirtle's crouch after going through the nightmare of fighting Kirby with Captain Falcon/Ganondorf, and found fairly useful information yesterday--
Squirtle non-moving crouch/D-Tilt goes under stuff! I've bolded the really important stuff.
On level ground...
Luigi - Up-angled F-Smash range is severely reduced; front side of U-Smash doesn't hit
Peach - standing and running grab ranges severely reduced
Donkey Kong - uncharged Neutral-B range is reduced (misses if you are right next to him)
Yoshi - front side of U-Smash doesn't hit
Ganondorf - can't standing grab; can't Jab; F-Tilt range severely reduced; can't Down-B; can't Neutral-B; can't shorthop Forward-B; F-Smash range reduced (if you are next to him, it must be down-angled to hit); can't D-Smash; can't use lagless shorthop D-Air
Samus - can't Forward-B, Z-Air must be sweetspotted to hit
Zero Suit Samus - all grab ranges severely reduced (only the tip at the end grabs); Jab range severely reduced, F-Tilt range reduced (only down-angled F-Tilt hits); Dash Attack range severely reduced; can't U-Tilt
R.O.B. - can't Jab1, F-Tilt and F-Smash ranges reduced (must be down-angled to hit); Down-B and item throw ranges reduced (must be fired from a distance to hit)
Fox - can't laser; F-Smash takes longer to hit (which is more easily powershielded)
Falco - can't laser
Captain Falcon - F-Tilt range reduced (must be down-angled to hit)
Marth - standing grab range reduced (if his hand touches the little arrow underneath Squirtle's tag, he lands the grab)
Ike - standing and running grab ranges reduced(if his hand touches the little arrow underneath Squirtle's tag, he lands the grab)
Snake - standing grab range reduced (if his arms touch the little arrow underneath Squirtle's tag, he lands the grab); can't Jab
However, I decided to look into it with slopes involved today, and it appears to be a real game-changer on sloped stages. These work on--
Yoshi's Island - the edges of the stage
Lylat Cruise - the left and right "wings" of the stage
Castle Siege - all slopes
Pokémon Stadium 1 - Water stage slopes (under the windmill), Fire stage slopes (center hole), Rock stage slopes (any significant angle)
Pokémon Stadium 2 - Ice stage slopes (platforms), Ground stage slopes (dirt mound)
Delfino Plaza - Beach slopes, Stairs slopes, Roof slopes, Shine slopes (the large ones), City slopes (umbrellas
)
Halberd - center slopes
Frigate Orpheon - center slopes
Rainbow Cruise - all significant slopes
Brinstar - all slopes
On sloped ground...
Mario - nothing
Luigi - can't U-Smash; F-Smash range severely reduced (only down-angled hits), can't Up-B sweetspot
Peach - can't grab at all, can't Jab, can't sourspot U-Smash
Bowser - standing grab range reduced; can't Jab1, can't grounded Forward-B; F-Tilt range reduced (only down-angled hits)
Donkey Kong - can't use uncharged Neutral-B
Diddy Kong - nothing
Yoshi - can't running grab; can't U-Smash
Wario - standing grab range severely reduced
Link - can't standing grab, running grab, or pivot grab
Zelda - can't standing grab or pivot grab; F-Smash range reduced (only last hit is in range)
Sheik - can't Needle Storm; running grab range reduced
Ganondorf - can't grab at all; can't Jab; can't F-Tilt; can't Down-B; can't Neutral-B; can't use any autocanceled aerials; F-Smash range reduced (if next to you, must be down-angled); can't D-Smash
Toon Link - all grab ranges severely reduced (must pretty much be touching Squirtle); can't shorthop B-Air
Samus - can't grab at all; can't use Power Missiles; can't Z-Air
Zero Suit Samus - all grab ranges severely reduced (only the tip at the end will grab); can't Jab; F-Tilt range reduced (must be down-angled to hit); Dash Attack range severely reduced; can't U-Tilt; can't Forward-B
Pit - can't standing grab or pivot grab; F-Tilt range severely reduced; F-Smash range reduced; can't falling B-Air
Ice Climbers - nothing
R.O.B. - can't grab at all; can't Jab1; F-Tilt range reduced (must be down-angled to hit); F-Smash range reduced (must be down-angled to hit); Down-B and item throw ranges reduced (must be fired at a distance)
Kirby - standing grab range reduced
Meta Knight - standing grab range reduced; can't running grab
King Dedede - grab range reduced (not by much); can't F-Tilt
Olimar - F-Smash range reduced; U-Smash range severely reduced
Fox - can't laser
Falco - can't laser; can't rising B-Air
Wolf - can't laser; Jab range reduced
Captain Falcon - can't grab at all; can't Forward-B; F-Tilt range reduced (only down-angled hits); D-Smash only sourspots (super-weak)
Pikachu - standing grab range slightly reduced; U-Smash range reduced
Squirtle - standing grab range slightly reduced
Ivysaur - nothing
Charizard - can't grab at all; F-Tilt range reduced (only down-angled hits)
Lucario - can't grab at all; can't Forward-B; can't Neutral-B (unless it's enormous due to aura)
Jigglypuff - nothing
Marth - standing grab range severely reduced
Ike - can't grab at all; can't Jab; F-Tilt range reduced (must be down-angled to hit)
Ness - Jab range slightly reduced
Lucas - Jab range slightly reduced; can't Forward-B
Mr. Game and Watch - Jab range slightly reduced; U-Smash range reduced
Snake - can't grab at all; can't Jab; can't F-Tilt1 (F-Tilt2 will hit)
Sonic - standing grab range severely reduced; can't Jab; can't Forward-B
I feel like these should be considered for counterpick purposes. Yoshi, Zero Suit Samus, R.O.B., Ike, and Snake all appear to be affected in a major way.
Squirtle non-moving crouch/D-Tilt goes under stuff! I've bolded the really important stuff.
On level ground...
Luigi - Up-angled F-Smash range is severely reduced; front side of U-Smash doesn't hit
Peach - standing and running grab ranges severely reduced
Donkey Kong - uncharged Neutral-B range is reduced (misses if you are right next to him)
Yoshi - front side of U-Smash doesn't hit
Ganondorf - can't standing grab; can't Jab; F-Tilt range severely reduced; can't Down-B; can't Neutral-B; can't shorthop Forward-B; F-Smash range reduced (if you are next to him, it must be down-angled to hit); can't D-Smash; can't use lagless shorthop D-Air
Samus - can't Forward-B, Z-Air must be sweetspotted to hit
Zero Suit Samus - all grab ranges severely reduced (only the tip at the end grabs); Jab range severely reduced, F-Tilt range reduced (only down-angled F-Tilt hits); Dash Attack range severely reduced; can't U-Tilt
R.O.B. - can't Jab1, F-Tilt and F-Smash ranges reduced (must be down-angled to hit); Down-B and item throw ranges reduced (must be fired from a distance to hit)
Fox - can't laser; F-Smash takes longer to hit (which is more easily powershielded)
Falco - can't laser
Captain Falcon - F-Tilt range reduced (must be down-angled to hit)
Marth - standing grab range reduced (if his hand touches the little arrow underneath Squirtle's tag, he lands the grab)
Ike - standing and running grab ranges reduced(if his hand touches the little arrow underneath Squirtle's tag, he lands the grab)
Snake - standing grab range reduced (if his arms touch the little arrow underneath Squirtle's tag, he lands the grab); can't Jab
However, I decided to look into it with slopes involved today, and it appears to be a real game-changer on sloped stages. These work on--
Yoshi's Island - the edges of the stage
Lylat Cruise - the left and right "wings" of the stage
Castle Siege - all slopes
Pokémon Stadium 1 - Water stage slopes (under the windmill), Fire stage slopes (center hole), Rock stage slopes (any significant angle)
Pokémon Stadium 2 - Ice stage slopes (platforms), Ground stage slopes (dirt mound)
Delfino Plaza - Beach slopes, Stairs slopes, Roof slopes, Shine slopes (the large ones), City slopes (umbrellas
)Halberd - center slopes
Frigate Orpheon - center slopes
Rainbow Cruise - all significant slopes
Brinstar - all slopes
On sloped ground...
Mario - nothing
Luigi - can't U-Smash; F-Smash range severely reduced (only down-angled hits), can't Up-B sweetspot
Peach - can't grab at all, can't Jab, can't sourspot U-Smash
Bowser - standing grab range reduced; can't Jab1, can't grounded Forward-B; F-Tilt range reduced (only down-angled hits)
Donkey Kong - can't use uncharged Neutral-B
Diddy Kong - nothing
Yoshi - can't running grab; can't U-Smash
Wario - standing grab range severely reduced
Link - can't standing grab, running grab, or pivot grab
Zelda - can't standing grab or pivot grab; F-Smash range reduced (only last hit is in range)
Sheik - can't Needle Storm; running grab range reduced
Ganondorf - can't grab at all; can't Jab; can't F-Tilt; can't Down-B; can't Neutral-B; can't use any autocanceled aerials; F-Smash range reduced (if next to you, must be down-angled); can't D-Smash
Toon Link - all grab ranges severely reduced (must pretty much be touching Squirtle); can't shorthop B-Air
Samus - can't grab at all; can't use Power Missiles; can't Z-Air
Zero Suit Samus - all grab ranges severely reduced (only the tip at the end will grab); can't Jab; F-Tilt range reduced (must be down-angled to hit); Dash Attack range severely reduced; can't U-Tilt; can't Forward-B
Pit - can't standing grab or pivot grab; F-Tilt range severely reduced; F-Smash range reduced; can't falling B-Air
Ice Climbers - nothing
R.O.B. - can't grab at all; can't Jab1; F-Tilt range reduced (must be down-angled to hit); F-Smash range reduced (must be down-angled to hit); Down-B and item throw ranges reduced (must be fired at a distance)
Kirby - standing grab range reduced
Meta Knight - standing grab range reduced; can't running grab
King Dedede - grab range reduced (not by much); can't F-Tilt
Olimar - F-Smash range reduced; U-Smash range severely reduced
Fox - can't laser
Falco - can't laser; can't rising B-Air
Wolf - can't laser; Jab range reduced
Captain Falcon - can't grab at all; can't Forward-B; F-Tilt range reduced (only down-angled hits); D-Smash only sourspots (super-weak)
Pikachu - standing grab range slightly reduced; U-Smash range reduced
Squirtle - standing grab range slightly reduced
Ivysaur - nothing
Charizard - can't grab at all; F-Tilt range reduced (only down-angled hits)
Lucario - can't grab at all; can't Forward-B; can't Neutral-B (unless it's enormous due to aura)
Jigglypuff - nothing
Marth - standing grab range severely reduced
Ike - can't grab at all; can't Jab; F-Tilt range reduced (must be down-angled to hit)
Ness - Jab range slightly reduced
Lucas - Jab range slightly reduced; can't Forward-B
Mr. Game and Watch - Jab range slightly reduced; U-Smash range reduced
Snake - can't grab at all; can't Jab; can't F-Tilt1 (F-Tilt2 will hit)
Sonic - standing grab range severely reduced; can't Jab; can't Forward-B
I feel like these should be considered for counterpick purposes. Yoshi, Zero Suit Samus, R.O.B., Ike, and Snake all appear to be affected in a major way.
