If I remember, when Type: Null was first revealed, it was in a trailer and not CoroCoro. Same goes with Jangmo-o.
Maybe Jangmo-o evolutions could be CoroCoro exclusive? I remember both Rockruff and its evo were CoroCoro exclusives since they weren't revealed in English until a while after they were revealed in CoroCoro. But with Type: Null and Jangmo-o revealed in an English trailer together, I think their evolutions might be treated the same, which could leave Alolan Grimer as this time's CoroCoro exclusive.
Maybe Jangmo-o evolutions could be CoroCoro exclusive? I remember both Rockruff and its evo were CoroCoro exclusives since they weren't revealed in English until a while after they were revealed in CoroCoro. But with Type: Null and Jangmo-o revealed in an English trailer together, I think their evolutions might be treated the same, which could leave Alolan Grimer as this time's CoroCoro exclusive.