Honestly just using 251 Pokemon is a bit of a problem for a few players who want to collect same-type Pokemon. Not a lot of Ghost-types, Dark-types, Ice-types, and Steel-types. At least there's more Fairy-types to use, since some Normal Pokemon were switched.
In the previous version of Indigo, we weren't allowed to build a team composed primarily of one type in particular; no Monotype Challenges, if you will. I feel it makes sense to impose that restriction here as well.
Oh, I got another question: will hidden abilities be part of the RP or nah?
Pokémon with Hidden Abilities would be particularly difficult to find, since each character only gets one capture per route. Neo will require a strong reason for finding one and adding it to the team. And you'd only get to catch one Pokémon with its hidden ability.