I don't really like to follow the format, but I can throw some stuff out there since no one seems to be posting. So, incoming wall of text...
Before I go into pokemon specific matchups though, I think the overall strategy is more important than any individual one. Firstly, camping is nothing but rewarded in this match. I know playing agresively might sound appealing because of the potential to gimp, but first consider fatigue. The pokemon has a certain amount of time(2:30?) before their attack is cut by 30%. In addition, each attack they use takes an extra second of this time. With no reflects or (good) projectiles of their own, camping puts you in a massively advantageous position. If he is forced to swap, your best option is a fully charged gyro to the face. I don't need to tell you guys how much these hurt
One thing to note is that they can do instant swaps on some stages. All they need a moving platform, with smashville being the best example. The details are a little much to go into here, the main the to know is that they can do it. I'm sure it's on their boards if you're curious.
Charizard- Honestly, out of the 3, this is the one I think is the biggest threat to ROB so I'll start with him. Or at least, I have the most trouble with him. Or the PT I played was just amazing with him. This is primarily because he has a great pressure game with grab releases, jabs, flamethrower and rocksmash. Even if you consistently beat him in the air and on the ground, he can catch up on damage amazingly fast if you make one mistake (for instance, a rock smash can do 50~%). DIing flamethrower can be a little tricky because that glimmering option of DIing towards him and punishing is always there, but it can cost you a ton of extra damage to get there. I prefer just DIing away from it.
He'll be looking to kill you with either a running upsmash, fsmash, or a rocksmash. On that note, his dair worries me a lot more than other spikes, don't just assume you can just meteor cancel and be safe, he can chase down a bit and if he hits you again with it, you're probably dead. He can also WOP well with fair.
As for how to win, he's as big and unmaneuverable as you are, except your attacks chain together far better, and in general out prioritize/speed him. Get him in fair chains, ftilts, grabs. So when out of your camping phase, don't ease up on the pressure. He's pretty heavy so be prepared to wait a while for a kill.
Ratio- 60:40 ROB
Squirtle Squirtle is generally considered to be the best of the 3 but he has some severe problems against rob. Primarily, you outrange and out prioritize everything he can do. He is very fast and small though, and can juggle you like mad
if you let him get inside. So the name of the game here is keep away. Stay grounded/shorthop height and wall when he approaches.
His onstage kill moves include dthrow, and upsmash. Once you get 120%, you HAVE to avoid getting grabbed or you're as good as dead from dthrow. DI towards the corners, if you try to DI to the side, it will just kill you there instead of off the ceiling. Upsmash will likely come out of some kind of "shellshifting" shenanigans, where he slides around hoping to land a grab or upsmash. Projectiles will make him stop, as will a well timed ftilt.
Off stage, fair can kill you if it's fresh and he manages to land one. If you're recovering low and he hits you with a dair, the last hit will shoot you down and away from the stage pretty hard, enough to kill you off the side a lot of the time. The important thing to remember is to DI
away from the stage if he hits you with it to avoid the last hit.
One final note is that squirtle has resistance to your booster attacks, and I think laser and fsmash as well. He's incredibly light, so you can still kill with them, but tack on some extra percent before they stale. Upthrow is an amazing kill option in this MU.
Ratio: 60:40 ROB
Ivysaur You will most likely only see ivy for a short time each match, he's incredibly bad against rob and your opponent will likely switch as soon as they get a chance, often off of a throw, or smash that don't finish you. Overall, your moveset completely dominates his, and if you can pressure him off the side, hug and he's as good as dead. He still has a couple trouble moves though. Bullet seed can do 40% if you get stuck in it, uair and upsmash can kill pretty early, as can vine whip if try something dumb like short hop -> nair towards him.
To make matter worse, ivy also takes extra knockback from your fire attacks.
Ratio: 70:30 ROB
Overall ratio: Hard to say, 60:40, 65:35 both sound reasonable though.
Stage selection- avoid moving platforms if you don't want instant swaps, other than that, I don't like battlefield because flamethrower becomes a pain and squirtle can use the platforms better than you.
