If you wish, you could make the wild Pokémon encounter take place in the next part. It should give Carl the confidence to add a new team member in the future, get the concept of catching refreshed and whatnot
I added a bit more in on our joint post. I'd like to end it with Aya's attempting to catch a teddiursa, but lets wait till it is my turn again to write. Including this in Carl and Aya's travelling time together should allow for a little character development.