OH YEAH
wtf i totally forgot.
reflex is like the only pro dude that mains both.
That's true.
Sorry, guys; didn't know that this was going on...busy with school and learning Samus.
ANYWAY
Yeah. This match is most obviously in Wario's favor for all three characters. I'm going to try and go in-depth as to why...
Squirtle. Squirtle and Wario actually more-or-less simply trade hits in the air; they both have fairly poor range, and all their aerial attempt to accomplish the same thing as their Wario/Squirtle counterpart. A big issue with this is that Wario is a fair amount heavier, which means that Squirtle loses a game of attrition. For both Wario and Squirtle, then, U-Air and U-Tilt (although the U-Tilt is a bit situational) can beat out D-Air. As a result, you should try to get Wario directly above you. You don't really lose the ground game, as Wario doesn't have moves as fast as yours there. You should be able to get off tilts here and there. Still, watch out for the F-Smash, grab, and his short-hop aerials.
Squirtle can't combo Wario as well as most characters, because Wario's retreating aerial movement is awesome. Granted, he can still do stuff, but he has to watch out.
To my knowledge, Squirtle is too short to do anything to Wario via grab-release. Plus, it's quite hard to grab a Wario. I'd say Wario's the hardest character to grab in general, but, eh...you'll want that D-Throw. Just don't make it really obvious.
Also, Waft kills at, like, 60%, even if it just got to KO potential (Half Waft, that is). Be really careful about that, because you really can't react to a move that comes out on Frame 5...
That matchup's not terrible, but it's not fun. I'd probably put it at 40-60 or 45-55.
Ivysaur. **** it all. While you've heard it a million times from people that don't know any better, this is probably the one matchup where it actually rings true; if you're off the edge, you're already dead. Wario can recover from virtually any distance. Because of that, expect a lot of attempts at Bite, F-Air, N-Air, or D-Air gimps.
One important thing; if he lands a Bite off the edge and you both start falling to your doom, DON'T PRESS ANYTHING. If that happens, he has to chew on you eight times before releasing, essentially killing both of you. Most people tend to panic, and that almost always only saves Wario. It sucks, but treat is as a Bowser-cide of sorts and don't bother trying to escape with Ivysaur, unless you're really good at pressing buttons and you can react immediately. This is probably the worst matchup of the three, so it's usually better for both of you to lose a stock and not worry about it.
As for what you can do...don't stay in place. As hard as it may be for Ivysaur, an immobile character is always easy pickings for Wario. Switch between various short-hop and full-hop aerials. Wario wants to get inside with short-hop aerials, so you have to mix it up to keep him guessing on when it's safe to come in. F-Airs and B-Airs do alright, and throw in a couple Razor Leaf attacks from time to time.
The best you can do while on the offensive is attempt to disrupt Wario's offensive game. N-Airs, B-Air -> F-Tilt, and well-timed grabs are what's going to get the damage up. If I'm not mistaken, Ivysaur cannot air-release Wario, so that's a no-go...as for a kill move, you're on your own. You're going to have to trick him with a Smash or F-Air, or U-Throw him at 170%...
Anyone with bad movement in general tends to get eaten alive by Wario (literally and figuratively). You have to mess up his rhythm and take advantage of that. STAY IN MOTION. This is not fun. I'm thinking 30-70, or even 25-75 if you want to be cynical...
Charizard. This one's annoying, too. Charizard has the issue of moving too slowly while in the air, and being a large target.
Wario is probably going to juggle you around the stage with short-hop D-Airs and N-Airs even better than Ivysaur...but at least you have decent tools to keep him from getting in. Flamethrower is a simple but nice one; just make sure you avoid his double-jump D-Airs when you do it. Because of Wario's bad range, Rock Smash is pretty viable for defense. I don't know if Charizard's N-Air works as any protection, but maybe a retreating N-Air would be decent.
One important note, especially because Charizard's grab game is so good, is the fact that you can air-release Wario from a grab. I don't have too much experience with it, but I know you can U-Tilt and U-Smash. You can probably short-hop Rock Smash, too, actually. It may be the perfect distance for a free 45%...I'll test it soon.
While that's nice to have, Wario's not just going to let you grab him. Pivot grabs are nice tools. If you can trick him into it, the Wario player's going to groan, though.
Don't shield too much, though. Wario can easily Bite most large characters, and Charizard is no exception. Sometimes throwing out a U-Tilt or U-Smash instead of shielding will allow you to counterattack the short-hop Bite you didn't see coming...it's a thought.
Focus on getting your grab when he's inside. When he's on the outside, you want to use lots of moves for spacing until you can catch him with something nice. Remember, you outrange him on the ground, so a F-Tilt or D-Tilt from time to time is something to keep in mind.
Also, Charizard has trouble getting his feet back on the stage, as always. Try not to get pushed off...
Overall, for Charizard, I'm thinking 45-65...maybe 40-60. The fact that Charizard gets thrown around so easily is a pain for me. Perhaps I simply need to work on my defense more.