I don't know if there are items for this, but instead of having to catch all the different types of Burmy's, can't you just make free items in the store we can get to change it's form?
I hate to be that guy who states the obvious, but that would pretty much ruin the whole point of the hunt. Beyond that, Burmy is not exactly hard to find.
I'm afraid it's not supposed to be easy (though it isn't that hard at all imo) and free items would defeat the purpose of PokéPoints so I'm gonna have to put down a no.
That's just one item that has no bearing on catching Pokémon or affecting your account, which are the main lures and uses for PokéPoints. The rest we want you to spend some time working for, but don't worry, it isn't too hard to get Burmy.
There aren't even other items yet, like evolution stones, so I think it would just be kind of weird to have items for changing a Pokémon's forme, especially for burmy of all things.