ok, as a main of both characters, ill give my imput of the match
difficulty: 40-60 olimars disadvantage
strategies olimars to employ: camp with pikmin and pivot grab, because we know good kirbies approach from 40 degree angles which olimar have trouble punishing so we will try to punish you for landing on ground and pikmin spam you for retreating bairs, and olimar will smash you when you get close and keep that pattern going, preferably on stages like bf will platforms
kirbies advantages/ disadvantages :olimar is generally light and will get killed around like 100% by kirby if not low % gimped, olimars range on ground will be what to avoid, so try not to be on ground but has trouble stopping short hopped bairs
watch out for: watch out for our grabs and at 80% and higher our smashes will kill you, with purple smashes killing at 60% your bair>all olimars smashes, don't go to high with bairs because if we catch on we will up-b you if your high enough, and don't try to camp olimar normally, eventually you will take damage, screw up stopping our pikmin, then be grabbed into a wtf hax chombo(there is an exception though)
how to win: off stage is the best way kirby can kill olimar, get olimar offstage any way you can, just wall of pain him of stage then get ready to edgehog him, watch out for whistle though, it gives invincibility frames, also, depending on the oli some will prefer to sheildgrab alot, if an olimar starts overusing that use this chance to grab him first then put him in the air for a few good combos, and chase grabs, just don't stand right below us on the ground, because we will ground cancelled nair->upsmash/dsmash you, killing if fresh at like 80% depending on pikmin, or if you can't get olimar off stage just pressure his sheild with all your aerials until he is forced to roll or spotdodge then punish, and don't be hesitant about using fsmash if you get an opportunity, because you don't get many, especcially when we sheild alot
spit out or swallow: unless you are going for a kirbycide you want to swallow, kirbies version of olimars pikmin plucks acts as like a machine gun of pikmin, destroying olimars camping ability, easily gimping him offstage, and forcing him to approach, swallowing should be a main goal in this match, because it will break olimar if you just spam it after you have his ability
what not to do: approach or fight from ground, go above olimar, try and sheildgrab olimar, try to camp olimar with up-b shockwave
counterpicks: rainbow cruise, japes, frigate orpheon, sv, ban: luigi mansion, bf, lylat, yoshis island, and other small stages with many platforms
keep in mind also olimar might try to go toe to toe with your air games if he/she knows what he/she is doing, mainly with fairs a little over your bair, so keep that in mind and punish if you see it coming, olimar also loves pivot grabbing so don't ever be on ground near him or relatively close,don't get above him, our up air will wreck anything but shorthopped dairs which we will sheildgrab, and don't go at 45 degrees due to olimars up-b unless you can bait it then punish, go for 40 and 50 degree approaches, don't approach to low of to high, to high=upair ownage, to low=running upsmash