I managed to dig up some data about the Trainer's stats for Festival Plaza, Hall of Fame and the like.
They are in the following addresses in HxD
1D28: Starter Pokemon
Rowlet: 00
Litten: 01
Popplio: 02
1254: Trainer skin color (use the corresponding values for your player gender)
Male 1 (Pale): 00
Male 2 (Default): 08
Male 3 (Tan): 10
Male 4 (Dark): 18
Female 1 (Pale): 04
Female 2 (Default): 0C
Female 3 (Tan): 14
Female 4 (Dark): 1C
127A: Battle Style set
00: Normal Style
01: Elegant Style
02: Girlish Style
03: Reverent Style
04: Smug Style
05: Left-Handed Style
06: Passionate Style
07: Idol Style
To unlock all Battle Styles enter the byte FF into offset 2583
Hall of Fame
25c4-25cf: Pokemon by species # used for 1st game clear
25d0-25db: Pokemon by species # used for lastest Title Defense clear
Festival Plaza
50d10: Festival Plaza custom name (changable @ lvl 20, 15 characters long in English)
50d0c: Total Festival Coins collected (not owned)
53250-532ba: Unlockable Common Phrases for Festival Plaza (set the bytes to 01 in this selection to unlock all)
Link Battles: 69c30
Battles at the Battle Spot: 69c3c
Battles at the Battle Tree: 69ca0
Battle against Wild Pokemon: 69c10
Champion Title Defense: 69d90
Supereffective moves used: 69c74
Z-Moves Used: 69cA4
Link Trades: 69c2c
Wonder Trades: 69c88
Trades at the GTS: 69c84
Deposited in the GTS: 69c60
Poke Beans Collected: 69c9c
Berry Harvests: 69c80
Money Spent: 69c4c
Battle Points Spent: 69c70
Fashion Items Collected: Determined on the actual amount of clothing items you have collected
Pokemon Caught: 69c18
Eggs Hatched: 69c20
Pokemon Petted: 69cd4
Beans Given: 69C94
Nicknames Given: 69c64
Pokemon Rides: 69c90
Exp. Points Collected: 69c58
Pokemon Caught: 69da8
Pokemon Evolved: 69db0
Pokemon Defeated: 69da4
Trainers Battled: 69dac
Festival Plaza Rank: 50d3a
Missions Participated In: 69dc8
Facilities Hosted: 69dca
Guests Interacted With: 69d08
Festival Coins Spent: 69c98
Shiny Pokemon Encountered: 69dc6
Loto-ID Wins: 69dbe
PP Raised: 69dc0
Outfit Changes: 69e04
QR Code Scans: 69dcc (69e14: # of Island Scans)
Photos Taken: 69db6
Missions: These are stored in the format of: PPSSTTTT
P: Number of plays (maximum of 999) S: Individual score (maximum of 999) T: Total Best Score (goes up to 99999)
eg. Put the values 10 00 60 00 9F 86 01 00 into offset 50d50 and it will give you 16 Plays (not visible in-game),a personal score of 96, and a group total of 99999 in "Break boulders quickly!"
The missions start at the following offsets: