I do wonder if certain Pokemon will only be available on one or two story routes, or if everything will be available no matter which story you choose? This is something that's been on my mind lately, because team building would be a pain if certain Pokemon can only be found on, say, the Team Star story route and not the Victory Road one. Of course there's nothing to suggest this will be the case, but it is totally something Game Freak would pull.I’ll probably use 3 different teams consisting of 9-12 rotating members per story route, and will then create an “all-star” team when challenging the Pokémon league
I do wonder if certain Pokemon will only be available on one or two story routes, or if everything will be available no matter which story you choose? This is something that's been on my mind lately, because team building would be a pain if certain Pokemon can only be found on, say, the Team Star story route and not the Victory Road one. Of course there's nothing to suggest this will be the case, but it is totally something Game Freak would pull.
Which would a minor shame since they keep advertising the ability to pick your own path on your adventure.I think it's pretty likely that you won't be able to do one route in its entirety before moving on to the next one. Even if you could you'd probably be over levelled for the other two story routes.
For example, the Team Star Fire base clearly as a big gate blocking your path forward, so presumably you'll be forced to deal with them before you can travel further into the region. (so there will probably be gym leaders you can't face until you've defeated Mela)
There's not much point in a big gate blocking your path if you can just go around it.
So to answer your question you probably don't have to worry too much about it since there probably won't be complete freedom to do whatever you want in whatever order you want.
i think cetitan will be the fully evolved form already. Its already huge and "finished" imoI'm picking Sprigatito as my starter and most likely using Ceruledge and Grafaiai. Might also pick Cetitan depending on what it evolves into.