Each guest in Festival Plaza, including yourself, is also ranked based on their Stats for given areas throughout their journey. Players are ranked based on the players that are in your Festival Plaza, so you can actually look for them based on the corresponding players. With their given data, you can check everything the other player has literally done in their given games.
Data Includes
Battle Records
Link Battles
Battles at the Battle Spot
Battles at The Battle Tree
Battles against Wild Pokémon
Champion Title Defense
Super Effective Moves used
Z-Moves Used
Trade Records
Link Trades
Wonder Trades
Trades at the GTS
Deposited in the GTS
Materialism Records
Poké Beans Collected
Berry Harvests
Money Spent
Battle Points Spent
Fashion Items Collected
Caring Records
Pokémon Caught
Eggs Hatched
Pokémon Petted
Beans Given
Nicknames Given
Pokémon Rides
Daily Effort Records
Exp. Points Collected
Pokémon Caught
Pokémon Evolved
Pokémon Defeated
Trainers Battled
Miscellaneous Records
Shiny Pokémon Encountered
Loto-ID Wins
PP Raised
Outfit Changes
QR Code Scans
Photos Taken
Festival Plaza Records
Festival Plaza Rank
Missions Participated In
Facilities Hosted
Guests Interacted With
Festival Coins Spent