Throw me a bone. This is going to be a hard challenge. At least let me use the incenses. They do specifically mention pokemon that are bred usingthe item.
I would also suggest that we be allowed to use fossils. I have not looked thru them to see if any are worthy of usin since they would all be pre-evolution, but think about these two petitions. Expecially the incenses - "anything with an item description that specifically mentions the pokemon".

Actually, the incenses do NOT mention the pokemon that are bred using the item, and the fossils don't mention what pokemon they become either, and none of the pokemon that come from those items can get as much of a boost from those items as any of the other pokemon I've listed. Remember, the point of these challenges is to try new things out and since you'll be competing with other members using the same sorts of pokemon, they will probrably not have a very high win ratio. So difficulty is therefore irrelevant.

They do mention it on the smogon website (i.e. - Odd Incense - Raises power of Psychic-type moves 20%. Allows breeding of Mime Jr.) But I guess it is your challenge. Can we at list pick one of our 5 pokemon that are not on the list? The thre best pokemon are all weak to ice, which is in abundance on GBU

5? Eh, perhaps I'll allow eviolite.

Too much change. I need a trick room user!

Use Porygon2, he's worked wonders for me as a trick room user :D

But he's not on the list. So I can use one that's not on the list?

I did mention that I'd allow eviolite.

Just one eviolite pokemon, right?

Well, it isn't really possible to have two eviolite pokemon lol.