Wow Beta one next week? You work real fast... no wonder this won the HOTW, you are amazing!! You were gonna do demo this week and that only has 1 gym. 3 gyms and in only 1 week?
And I like the idea of Gible as the starter as that is unique... but you might have to change some of his attacks because it's going to be a little difficult working with him. And his final evolution needs a more beastly attack because the Dragon Rush is level 55 and we can definitely get higher if he is our first pokemon.
I suggest teaching some of the egg moves because they can be useful:
Dragonbreath,
Outrage,
Twister,
Thrash,
Metal Claw,
Iron Head are all moves that it does not learn by level but could learn through an egg. They are stuff you can put in the game so we learn some moves later, and they just get all the moves in general