No it's random because Iris just recently caught Dragonite (well 52 episodes ago might seem like a long time ago but it isn't), and Cilan on the other hand hasn't had a team change for a lot longer, even ignoring the possible evolution episode.
Originally Posted by yuoke
Iris does not need a 5th Pokemon, let alone a Lapras, when Cilan only has three, and Iris barely does more than Cilan to warrant her having 5 Pokemon with him only having 3. EVEN if Cilan ends up going to Kalos with Ash (well as in traveling companion of Kalos, not actually traveling there with him).
Misinterpreting my posts is not your fault, negative repping me, and getting very sensitive about my posts because you misinterpreted my posts however is your fault. Think really hard, before negative repping or making a big deal about my posts. I don't appreciate being negative repped for reasons that are a result of misinterpreting my posts.