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Ribombee is going to have to do a lot of heavy lifting because the rest of Lillie's cards are kinda ass. Clefairy is niche incase Dragon mons get out of hand but the attack is mid at best and not enough to carry a competitive deck. Comfey is trash if the pool it can search out are two other cards and itself. Her Pearl is pretty strong but useless if the only cards it can work on suck. I don't think any sort of stadium or supporter that will work on her Pokemon would change much.
The best I could hope for is if the bee has some sort of item or ability lock. Making a target that shuts down decks give up no prizes would be pretty strong. I just want a playable Lillie deck, bros but she's not getting a lot of cards to work with compared to the other Trainers.