It really seems to me that Butterfly Dance is her claim to fame and without useing it she ends up a slightly more offensive but a fair bit less bulky Venasaur (and without Vena's Poison Type).
Well the Hidden Power type is still variable but Fire or Ice would be ideal as it does cover one way or another one some of her resists - bugs, flying, and grass - though the trade of is that it certainly won't handle other bulkier ones that may resist her - dragons or steel (both of which are quite common and threats) - when you pick one over the other.
I do agree Butterfly Dance is her claim to fame, even with her support moves I don't necessarily see her outdoing the job of Meganium as a cleric nor would she be a bulky leech seeder. Add to that the consideration of Erufuun (the grass sheep) who thanks to his skill or speed can run a support - sans sleep powder & clerical abilities - potentially better.
While I am somewhat hesitant about giving her Solar Beam + Butterfly dance in a sunny day team since sunny day already acts as a support in the first place by allowing a powerful STAB move to be fired off instantly along with a speed boost if you opt for Chlorophyll. She'd have to use one extra turn so as to pull off butterfly dance which would already boost her already doubled speed just so she could gain a +1 in her SpA which could be dangerous as the enemy could switch out to counteract her during that time - like bringing in Politoed or something with Cloud Nine or worse just burn her off with a fire attack.