>>56471321Onix has 70 base speed... and anything you can catch before that gym battle is either going to be outsped, or weak to Rock type attacks... other than Roselia, but you're likely not gonna have a Roselia by this point without grinding hard
That said, Turtwig usually cleans up here, or if you can get Budew to evolve, which again, requires heavy grinding of friendship mechanics, which isn't feasible at this stage of the game... Piplup can do it, but will probably be worn down by the time Cranidos comes in
