i would have to agree with 55/45, there seems to be a slight advantage here, since wario really can control the pace of the match with a good pressure game.
low percent gimps are obviously key here, make use of the bite a lot and the fair, these two will really help you score gimps. The bite is great cuz off of a single jump you can pull them down very far and it pushes them away, usually too far to recover. the best part about the bite is it cuts throught the whistle, which hurts most characters chances to edgeguard them.
Other than good edgeguarding, its a battle on the stage to avoid the pikmin and grabs, which can rack up the damage quick. If your good at the waft placements, this matchup should be pretty easy for you.
also, i feel like upb'ing to get the pikmin off is really risky, at least on fd. I guess if your far enough away and/or near a ledge you could try it, i'll look into it more