All three of these featured sync pairs are Fair-exclusive, and have expanded sync grids, as well as the ability to be raised to 6★ EX.
As usual for Poké Fair Scouts, 5★ Sync Pairs will have a 10% chance of appearing, with the three featured trainers having a higher chance of appearing than non-featured sync pairs in the general pool.
- Sources
Pokémon Masters EX official site
Pokémon Masters EX official site Strategy and battling gamepokemonmasters-game.com