Squirtle does not have great Smashes. What he has is Usmash and that move is only relatively good. His grab range is poor, and his throw game lacks for comboing. Having a killing Dthrow just isn't that crucial, or at least shouldn't be for a normal character except Squirtle sucks balls at killing (edge guarding is a different story sometimes) so he might have to rely on that as a killing option. He doesn't have the range to play a poke game on the ground, and unfortunately much of the little range Squirtle does get around to using, he thrusts his body/tail into the move so it's not as impressive.
He's hard to use well and pretty gimmicky. He's an obvious target for buffs imo: Uthrow being a great place to start.
Ivy I'm not a fan of, but for different reasons. She's too defensively orientated in a fairly offensive game. For approaching, she doesn't even have the luxury that Squirtle has of trying to be mobile and mixup grabs to beat shielding. If you jump in the air with Ivy and your opponent is grounded, it tends to be a mistake like 80% of the time. That's just for approaching though, she can try to make do with SH Bair or Razor Leaf defensively.
(No seriously, jumping with Ivy for whatever approach you have in mind is a bad idea. Please don't do it)
Zard is like, 1-2 changes away from being incredibly strong. I'd cringe if he had an Uthrow that was better for CGing or comboing. *Shudders* He has good traits, tends to only get abused by the mobile approaching gods/up close stuffers. I'd put him at the fringe of being in the top or lower half of the game.
