So, I feel there is a bit of hatred towards Ivysaur. I'm conflicted about it, being a main of said character. On the one hand, she's in a fine place right now : not winning too many tourneys, not absent either. On the other hand, if people are complaining so much, maybe it is that she's not up there for the right reasons.
So I figured I'd give feedback as to what parts of this character do break a Smash law in my ever so slightly less biased opinion (or rather, biased in another direction), eventually suggest a way to alter it, and let you be kind and compensate somehow for the losses.
1) Her recovery. Tether recoveries as of now in PM do not just look and feel different from normal recoveries : they are simply better. When doing a normal recovery, there are two scenarios, and two outcomes : either the opponent is on the ledge, in which case you land on the stage in a helpless state, with a lot of lag, or your opponent isn't occupying said ledge, and it's up to you to either sweet spot it, or simply grab it with a bit of vulnerability. In either of these scenarios, Ivy's recovery is achieving better than a normal recovery. If there is an opponent on the ledge, she does land on the stage, but she's given the opportunity to stall the opponent's invincibility frames, countering the strategy, and she doesn't land in an helpless state. If there isn't an opponent on the ledge, she doesn't have to aim to sweetspot the ledge. At least one of these advantages has to go, so that at least half of the opponent's edgeguarding gameplan can still apply on Ivy.
2) Her Razor Leaf. It has very little answers, and shielding isn't one of them. There are two immediate solutions for this : either make shield reflecting easier and more reliable (I've had a couple times my Razor Leaf powershielded, but not reflected, and that was very awkward), or make the projectile disappear on shield, like PK Fires did in Brawl. It is important to note that either of those solutions involve a change in the pace of tossing Razor Leaves around, due to the limitation of only one RL on screen at a time. Reflecting a razor leaf doubles the move's cooldown, thus hinders Ivysaur a lot, and deleting it halves it, thus helping Ivysaur in a sense. By doing both, you would really put the emphasis on getting that powershield to approach, and not just shielding it. That sounds like an interesting concept to me.
3) Her bair. It has Marth's fair range, but hits twice. Which is to say, it is VERY good. It instantly negates any form of approach from the air, by outranging basically everything you could possibly throw at me. I know it would break yet another smash law to have an aerial with special priority, but if aerials could actually clash with it like they do with projectiles, I think that would help a lot of characters that currently do not have an answer to this move. The most intuitive thing would have been to give it lazer priority (like MK's moves), but it wouldn't have helped the projectile-less characters like Falcon, which need it the most. So I guess I am actually suggesting the opposite thing.