squirtle has an advantage, honestly. tlink can hardly space squirtle at all. water gun lols at all three projectiles and squirtle is fast and small enough to hit as it is. squirtle is tiny enough that zair spacing is annoying to even attempt. up close, squirtle wins out. his attacks are much quicker. although tlink's hitboxes are disjointed, they don't come out quick enough (like yoshi) or have enough range (like marth, ike) to space squirtle well. tlink unfortunately doesn't excel at either, which you need against squirtle. squirtle's grab game is almost as good as charizard's, and more effective here because he's so small and mobile. he can slide 1/2 to 3/4 of battlefield as he does his grab during a hydrowhatever.
squirtle outspeeds anything TL can do at ANY point. this is at least 60:40 advantage squirtle.
water gun really bothers tlink's up b recovery, but can be easily avoided with that tether.
tlink>ivysaur far away, but ivysaur is not bothered by projectiles as much as most other characters. ivy's bair easily cancels out arrows and boomerangs, and comes out in 4 frames with very little cooldown. razor leaf cancels out boomerang and arrows. TL's projectiles are about as easy to PS as Ivy's own Razor Leaf is. you won't be able to keep ivy out of your hair for very long.
Ivysaur
Forward Air: 14
Back Air: 4
Down Air: 11
Up Air: 12
Neutral Air: 4
Toon Link
Forward Air: 14
Back Air: 6
Down Air: 11
Up Air: 11
Neutral Air: 6
really similar, ivysaur's bair has pretty equivalent range to TL's own zair. not sure how quickly TL's zair activates, but i'd say zair and bair are on very even footing.
on the ground...
Ivysaur
Jab: 7
Forward Tilt: 6
Up Tilt: 9
Down Tilt: 4
Dash Attack: 4
Toon Link
Jab: 6
Forward Tilt: 11
Up Tilt: 8
Down Tilt: 9
Dash Attack: 9
again, ivysaur kind of wins here. ivy's ftilt outranges all of TL's tilts. for real. same for jab. TL's smash attacks are fairly quick, but i assume that he really needs to save them to kill, because if you use your smashes early on ivy and ivy ends up switching to charizard at the end of its stock...you'll hate yourself for it.
ivysaur needs to pressure you very well with nair combos into utilt and bullet seed, bair chains, and the like. honestly once ivysaur gets inside all the projectiles, TL will have a tough time getting ivy back out. i think 55:45 TL's favor is pretty reasonable.
Charizard...
charizard is bothered by the projectiles moreso than Ivysaur is. it's not hopeless though. far away, yeah, charizard will just have to get in there somehow. fortunately zard has the 7th fastest dash speed in the game to aid him somewhat. at midrange, TL's spacing is muuuuuch less effective because of zard's specials.
flamethrower cancels arrows and boomerangs out. it's an excellent approach when shorthopped at mid distance, because it outranges zair.
rock smash. rock smash also cancels boomerangs and arrows out, and breaks on impact with these moves, causing tons of hitboxes to come out before they normally do. rock smash does a TON of damage guys, and that's bad bad bad for toon link. the thing is that toon link has a lot of trouble killing heavy characters. charizard does not have trouble doing huge damage to opponents in a short amount of time (flamethrower and a move that can do 45% in 2 seconds) and lots of powerful kill options. charizard can wreck TL up close if you aren't careful. zard's grab itself is probably the best in the game. maybe second behind dedede's. but zard's grab has more range than ddd's, and charizard has RIDICULOUS dash speed for how big he is and how big that grab range is. powershielded zair can be punished with a simple dash grab if you aren't careful. zair spacing is pretty effective against zard, just be careful. charizard is NOT like all the other heavyweights out there, he can get inside VERY quickly and start beating you up.
overall, i'd say about 55:45 TL's advantage or 60:40. if the charizard knows how to handle most bomb setups into kill moves, then his stock will probably last longer than yours. remember, charizard has the 7th fastest dash speed and 13th-14th fastest air speed. charizard is big, but not slow at all.