I like how the writers decide to evolve pokemon that Ash had hardly used in the series to their final forms so quickly whereas they decide to either approach this evolution slowly or not at all for some of Ash's more used pokemon.
I'm surprised Palpitoad wasn't shown to evolve to its final stage, though. Boldore is understandable as it is a pokemon that had evolved recently and Krokorok is a pokemon that Ash should obtain very soon.
I don't know if the writers are planning on evolving Axew and Pansage, though. They are the only pokemon Iris and Cilan have on them that are able to evolve after this.