if its just ivy vs samus.......
Samus recovery> ivys.
I have bomb jumping
Im more floaty
My tether is longer than yours
I have a UP+B(that isnt a tether)
Almost everyone's recovery is better than Ivysaur's (which covers three of those statements).
Still, if Samus can't get an offstage Z-Air (which is difficult because of their differing fall speeds), Ivysaur should come back every time.
Ivysaur actually prefers fighting floatier characters. Easier to hit with aerials and landing characters with, say, F-Smash or grab.
Ivysaur can deal with Samus's tether recovery (and recovery in general, actually) fairly well by tethering from immediately above the ledge.
Samus projectiles> ivys.
Lock-on Missle
Super Missle
Charge shot(low-medium-fully)
Zair(its considered a prijectile)
Razor Leaf isn't exactly the greatest projectile in the world, but it will get through at times. I'm not sure if the Z-Air cancels it, but if it doesn't, it should be a small issue.
Having better projectiles doesn't mean much when (MOST) projectiles in Brawl aren't very useful.
Fire>Grass
Double knock back from fair/U-smash/D-tilt. Does fire do anything else to grass?
10% more knockback isn't a significant difference, especially when Samus's moves are so weak. D-Tilt kills at about 10% lower than it normally would, and the other two moves are almost never going to land well.
Can ivysaur gimp other than tether? Samus can shoot homing missles to knock u off your tether attempt. I can walk off and zair and double jump back and zair AND then UP+B to stop u from grabing the ledge.
I can walk off and spike at any give time and nearly any give depth and STILL come back safe.
Ivysaur's gimping game is actually rather good. One just has to make sure you don't get hit in a bad way while doing so.
If Ivysaur gets a N-Air spike on a recovering Samus, she's ****ed. D-Air is pretty easy to land from above, as well.
B-Air eats mid-air jumps, but isn't that useful for gimping against Samus. Still, it WILL keep her off the stage if she's recovering.
If Samus isn't abusing invincibility frames with her tether recovery, and a Z-Air isn't coming immediately, Razor Leaf will help, as always.
If Ivysaur recovers from above and avoids the Z-Air, she should be fine with recovering, though. Samus can't come from above, because that's begging for a U-Air/Up-B/F-Air/Bullet Seed, and Ivysaur can control the ledge for edgeguarding well.
Your best spacing attacks is bair and razor leaf right9correct me if i wrong)? ALL of samus projectiles out reach that AND they all combo into something(grabs, CS, dash attack, dair....ect)
B-Air from above, and there isn't a lot that Samus can do except move backward and Z-Air/less useful projectile. Outside of the Z-Air, all of Samus's projectiles can be avoided with a normal human reaction time, which makes it somewhat difficult for Samus to use them as consistent spacing tools, especially when Ivysaur's running speed is pretty good.
Though IMO samus is not bette than PKMN T, she IS better than ivysaur in EVERY WAY,SHAPE and FORM.
She might be better (though I really, really doubt it), but not in a lot of ways.