Like many others have said, I always treat my first playthrough a new region a certain way:
- Whichever starter that I choose will stick with me for the entirety of my journey, and I've long decided to choose Rowlet for that role. Abandoning my first starter in a new region just feels dirty. XD
- The first game that I play in a collection (which will be Moon this time 'round) becomes my main game, so while I'll probably restart Sun a few times over I'll likely never restart Moon. I'll also be aiming to complete my Pokedex on Moon and discover/do all of the things - at least throughout the main story. For some reason I often put more energy into the post-game of my second playthrough a region verses the first, likely because the first run is more focused on fleshing out my Dex and finding all of the hidden secrets/items/etc.
- Unless a Pokemon has a vastly new move pool or a new gimmick (such as a new evolution, new form, or Mega Evoltuion) I'll only train Pokemon that I've never raised before during my first run through a region. Obviously Alolan Pokemon are a thing this gen and you can bet that I'll be aiming for Alolan Raichu - if not Alolan Sandshew/Slash and Marowak as well - but it's worth it. The way that I'll be using the Alolans will differ from how I've previously trained those Pokemon, and that prospect makes me really excited. ^^
- Speaking of my team, I can never stop at just 6 different Pokemon. That just feels far too restrictive! The chance of me raising upwards of 11 different critters is very, very high, especially with the added bonus of Poke Pelago. Now I'll feel less guilty when any of my team members are sitting ignored in PC boxes. :'D
- Usually I always pick the female player character for my first run and name her after myself (Katie), then choose the male character afterwards and name him Kenji, but this time around I've decided to change things up. I'm going to let Kenji have the first romp around Alola because dressing up the male character in X/Y was so much more fun than customizing the female. ^-^
- I'll be spending hordes of time with Pokemon Refresh, Poke Pelago, and the Festival Plaza (I love features like those), so I wouldn't be at all surprised if my playtime ends up being 70+ hours before I actually finish the main story. I believe that I'd capped 90 hours on Y by the time that I actually took down the Champion of the Elite 4.
- While I'll take note of EVs and IVs, I won't bother thinking about them too much. The first adventure is all about the fun and discovering a new region, so any serious breeding or competitive team plotting can wait until later.
- Finally, as far as my team goes I've already mentioned a couple of Pokemon that I'll definitely train (Rowlet and Pikachu for Alolan Raichu). I also have my eyes on Rockruff (though I'll be badgering someone to help me obtain the Midday evolution), Wishiwashi, Type: Null, Pikipek, Salandit, and maybe Sandygast if another ground-type doesn't catch my attention first. I'm debating picking up a Mimikyu as well, but something tells me that guy would benefit from competitive breeding. Beyond that things are fairly open and I'm looking forward to discovering what pops up along the way. Jangmo-o has a high chance of joining my team if it appears early enough, for example. We'll see what I encounter. ♥