OK i have played ALOT against wolfs that just sit and spam lazer, and dont approach no matter what. I have played GOOD ones. Heres a few of the things that i do...
Olimar cant easily outspam wolf... wolf can just lazer and you have to aviod his lazer and throw pikmin, and they get knocked off rather easy. A skilled olimar can outspam wolf though, wolf will eventually have to approach you (if you are indeed skilled and dont get hit) (i suppose this is just theory, i havent yet been able to perfectly doge all wolfs lazers) You throw pikmin at wolf, they get knocked off, but they Still hit him once or twice. He still gets hurt. Throw pikmin and doge lazers (very hard) and eventually he will approach. Now you might ask... well how do you doge the lazers. Well for starters you can throw pikmin at him with a full jump or double jump, then as you land near the ground airdoge and hold it down and you will shield as soon as you hit the ground. i suppose you can spot doge as soon as you hit the ground as well. you can throw pikmin to interrupt his lazers ( if a pikmin hits a lazer it will stop it (except maby yellow) I know with falco you can Fair his lazers and not get hurt. Theres powershielding.
I think if you throw a yellow near wolf, it will block lazers as its walking back (havent tested this but i think this is true) Also you can throw pikmin on certain parts of characters body, usually if you throw one on someones hand it will stop it (like throwing a red pikmin on mario's hand to stop his fireball)
I think a yellow pikmin on wolfs hand will stop his gun for at least one shot, which leaves him open.
A yellow will also fsmash through his lazer.
One thing that ive noticed is, if you continue to spam eachother, olimars pikmin will die of course, but usually the purples last alot longer... so you will eventually start ammassing them, and they rock against wolf, they hit him in the face, if you have several you can use them rather effectivly. they go short range and medium range rather well. Hit him in the face with those purple pikmin! he will get knocked back.
I think olimar has the advantage in advanced camping game. Wolfs lazer is much slower in the air, the best thing for him to do is sit and spam lazer, and thats rather predictable. I think good olimar players will eventually be able to out camp wolf with some practice.
Assuming you cant outcamp him, if you arent skilled enough. theres several ways to approach. some things i will do is....
If you airdoge right before you hit the ground, then input whatever action you want to do (like jab) then it will do it immediatly the first frame you can when you hit the ground. (if you do it right)
jump till you get above him and fastfall a Nair. It can out prioritise his upsmash.
Jump till you get in front of him, fall and airdoge right before you hit the ground, then jab
In your case, if he shields when you come in the air, jump just past him and grab him.... he will have to turn around to grab you.
jump till you get just past him, land and roll behind him and do whatever. This will confuse him
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As soon as he see's you behind him he will turn around, but you will be one step ahead of him.
jump to him airdoge near the ground in grabbing range (for you) and grab him. You have to time this right for it to work, and if you get too close his gun will hurt you.
jump to him, airdoge right before you hit the ground and spot doge the grab then grab him or whatever.
Run into him, do a sliding spotdoge (hell if i know how your going to run past the lazers :0)
If you Fair him, just do it with the tip of the pikmin so you can back up far enough that he cant shield grab you.
jump into him, airdoge before you hit the ground... Uptilt (can out prioritize his Fsmash on the way up)
The key is to know what he's going to do before he does it, if you can predict what he's going to do (if he's predictable, which he most likely is) And you can use whichever of these techiniques will counter
what he does.
If wolf spams fmash the best solution is probably to spam grab, you can usually grab him before he can get into range to fmash. You can also shield and grab.