You can't even have 1 dwarf gourami in a 10 gallon, let alone 1 pearl
Yes, Dwarf Gouramis are fine in a 10g, but almost all other gouramis are much too big--including Pearls.
Are you talking about the Cherries/Zebras? If so, a shoal consists of at least 6 fish, so you need to get at least 6 of them but the more the better as long as your tank can support them.but how many should I have of either?
all the compatability things said that bettas get along with sharks, cherrys and danios