Get a bronto on a swamp and you'll get all of the berries you want, The swamp has alot of Cattails and bushes and i get 150+ berries each bronto tail swing (Nacros, Stimberries, Azulberiess, Mejoberries and Amarberries each 150) And i just have a 300%+ Melee Bronto, not even mutated or imprinted.

(Also 1x rates.)