That would kind of be Lip's stick but it's not Lip using a flower it's Daisy.
Not only is Lip's Stick is an item, but its effect is far off from using spawning multitudes of petals and hitting with them.
I don't really think that's much as good either...and again for her sports things, that does not give too much either that is not already done. Wii Fit Trainer already has her soccer ball head pound, Peach already has the thing I mentioned which represents the spin-offs enough already, Waluigi in his assist trophy uses his tennis racket. What else could she go off of that isn't already done? All of these are already present in Smash. She doesn't bring much to the table
Peach and WFT having one sports move each doesn't prevent someone from having a full sports-based moveset. It's like saying
wouldn't be unique because
already has F.L.U.D.D. And why should Assist Trophies interfere with newcomers' chances? They're not even playable.
And like I said, Daisy uses her petals alongside the sports equipment, which is already quite unique. Peach just swings her club and racket. Mario Sports games typically involve the characters bringing in other elements that go with their theme. The attacks in the Daisy moveset I made either had petals alongside sports stuff, or the petals were the focus of the attacks.
Other than petals, crystals have shown up a couple times as Daisy's special moves. Also Daisy can use other stuff from non-sports games if necessary.