The way I figure it, Mario loses to Squirtle cleanly head-to-head. Instead, Mario has to rely more on his OOS options, anti-airs (Usmash beats his aerials cleanly and utilt trades or beats them), and his own pokes to get his damage. Coupled with fireballs and Squirtle's light weight, I think the overall advantage that squirtle has here is rather small, if that. I think the issue comes when Marios approach this match-up without realizing that Squirtle runs circles around Mario when it comes to mobility and frame data.
I agree about Ivy, and it's reasonable for a PT to get her out of the match if they want to before much damage is done.
Zard 's range is problematic, but it's kinda offset by his size and vulnerability to combos. Zard doesn't have the tools to keep Mario out indefinitely, nor does he have the tools to keep Mario from wreaking havoc once he's inside, AFAIK. His size also makes fireballs easier to utilize to get inside or get some space if feeling pressured. If I had to tack a match-up rating to Mario v Charizard, it'd probably be 0.
OVERALL, I don't see an advantage here. Maybe I'm underrating or overrating elements of the match- up, but in a pairing that happens so very little, no video evidence to speak of, and few active and skilled mains of either character (AFAIK)...it's hard to get behind an advantage in PT's favor, especially since it's not even a definite one in theory alone.
I guess everyone has a different opinion on this MU I feel Mario wins lol.
I've used some Mario in my time, and many people have a reasonably solid one around here. The only famous Mario I've played is Boss, who I recall doing quite well against, though it was a while back. The stats are definitely in PT's favor a fair amount.
Squirtle has at least a slightly better juggle game, better ground pokes (faster jab, stupid F-Tilt), and Squirtle's shortness combined with a great grab range means that getting grabs to start a juggle isn't difficult when Mario has to run up on him. Ivysaur spaces alright on the ground with tilts and F-Smash, as well as spending a ton of time pivot grabbing to minimize Mario's opportunities to get in (not that Ivysaur wins, but, it isn't terrible to manage to B-Throw and switch). Charizard outranges him in in the air and on the ground. Rock Smash trades with many of his moves in general, and short bursts of Flamethrower make it difficult for him to run around.
Take it or leave it. We do the best we can.
now you see i think it's in Mario's favor, I've played alot of Pokemon Trainers. Squirtle I found that Fireballs can kinda force an aproach on Mario I say kinda because it doesn't always work because squirtle can air camp and aviod them and Jab clashes with them but he's no MK his fall speed is faster and he only has 2 jumps. I think On stage Squirtle has a slight advantage because of his superior speed and having a juggle game which can rival/ possibly beat Mario's as you rightly say but off stage i'd say Mario's got this by a slight amount, whilst squirtle's water gun is like a better version of Mario's Fludd, Cape can wreck squirtle pretty badly and Squirtle's up B doesn't go very high. In terms of Killing if Mario avoids Squirtle's up smash then it will become a contest of endurance and in the long run Mario will win because of Pokemon Trainer's stamina issue, Squirtle is also light so basically Squirtle will loose his killing ability and he's light too so Mario will I personally feel get the kill first if the Mario is the same level as the Squirtle and knows the MU to a similair degree.
overall though i'd say Mario V squirtle is evenish if i had to give it to one i'd give it to squirtle as Matador said Mario has to rely alot on OOS aproaches and Squirtle's air game is a bit better than Mario's also if i had to give a figure i'd say 0 becuase Mario has decent ant air options but if one has to win i'd say squirtle
Ivysaur i think is quite possibly one of the worst characters in this game, and I don't think ivysaur stands much of a chance against Mario especially since Ivysaur is damaged by fireballs more than normal, as well as having a horrible air speed meaning Mario has better gimp options also Bullet seed i don't think is that effective if Mario knows how to DI that along with the fact Mario is kinda light. Mario's B-air is faster than any of Ivy's air spacers and honestly I think whilst Ivy's forward air has more range i don't think it can Beat Mario's aproach options and B-air I feel isn't a very good hit box. If you combine the fact mario Juggles Ivy quite easily with rapid Up airs and Ivy takes more damage than normal from flam based attacks fireballs and F-smash look quite promising. Down smash ivy if she's at the ledge and she's pretty much dead at the higher percents. I think razor leaf is an anacronism the start up means it's predictable and easily power shielded.
Overall I think Mario wins by about +2 (maybe an over statement) but he definetly beats Ivysaur.
Charizard I feel is like fighting a better version of Bowser, mostly because his Rock smash is such a good kill move and can beat alot of Mario's moves if timed right, but his abismal air speed means he's easily fludded and caped off stage. fireballs aren't particularly effective on Chari his multiple jumps and good range mean that whilst he's big with a bad air speed they aren't a problem for him. His dash speed is quite good Flamethrower can be anoying but Mario can DI into it quicly and get a free super jump punch. Chari has to try hard to keep Mario at a distance because if Mario gets in close he racks up damage very quickly with up tilt up air Juggles and wall of pains (if they happen). I think they're evenish on stage but like the other two pokemon chari's recovery lets him down against Mario. A tactic i found effective as Mario against all 3 is to just N-air them off stage and try to predict/punish them when they're trying to get back on stage, I wouldn't N-air at early percents though because the sour spot can be disastrous as it doesn't send anybody that far and you'll most likely be punished after you've used it.
Overall i'd say Mario takes this because i think Charizard has to play a bit more safely than Mario does even though his rock smash can make him difficult if Mario is underneath him or gets him off stage he's pretty much dead.
slight advantage for Mario maybe +1
PKM Trainer overall I think Mario wins, Squirtle is a tough opponent for anyone and Chari is hard if you don't have much exp but runs into problems off stage. Ivysaur is at a clear disadvantage, sheer lack of speed and an even worse recovery Mean Mario's got the advantage I know Mario's recovery isn't great but PKMN Trainers all 3 mons are quite gimpable with what Mario has. Even though PKMN trainer can keep squirtle out more than the other two by switching PKMN trainer still has two mons that I feel clearly loose to Mario and one thats even to slightly against Mario but very close to even.