A cool Pokemon idea

[Pokelego999]

So I was thinking recently, what if Pokemon had Type Specalists in the postgame? Like, you'd beat the Champ, and then you could find people who specalize in a certain type (Dragon, Rock, Fire, etc) in random locales. They'd be far tougher than normal Gym Leaders/Elite Four and would earn you a title like Fighting Master or Bug Master or whatever.
I even came up with some teams. No movesets yet, but this is the general idea I came up with. I also excluded Starters and Legendaries.
Normal: Snorlax, Blissey, Slaking, Lopunny (Can Mega Evolve), Furfrou, Dubwool
Fire: Flareon, Darmanitan, Pyroar, Centiskorch, Chandelure, Houndoom (Can Mega Evolve)
Water: Wailord, Milotic, Wishiwashi, Gyarados, Lapras, Sharpedo (Can Mega Evolve)
Grass: Gogoat, Lurantis, Exeggutor, Shiftry, Gourgeist, Flapple (Can Gigantamax)
Flying: Honchkrow, Togekiss, Staraptor, Altaria, Aerodactyl, Pidgeot (Can Mega Evolve)
Fighting: Sirfetch'd, Hawlucha, Heracross, Bewear, Machamp, Lucario (Can Mega Evolve)
Dark: Umbreon, Zoroark, Sableye, Bisharp, Obstagoon, Absol (Can Mega Evolve)
Psychic: Espeon, Wobbuffet, Musharna, Meowstic, Gardevoir, Alakazam (Can Mega Evolve)
Rock: Gigalith, Archeops, Lycanroc, Tyranitar, Rhyperior, Coalossoal (Can Gigantamax)
Ice: Glaceon, Vanilluxe, Mamoswine, Frosmoth, Abomasnow, Glalie (Can Mega Evolve)
Poison: Arbok,Nidoking, Crobat, Galarian Slowbro, Drapion, Garbodor (Can Gigantamax)
Ghost: Mismagigus, Dusknoir, Cofagrigus, Mimikyu, Dragapult, Gengar (Can Mega Evolve)
Dragon: Dragonite, Haxorus, Garchomp, Noivern, Hydreigon, Salamence (Can Mega Evolve)
Fairy: Sylveon, Clefable, Florges, Slurpuff, Hatterene, Alcremie (Can Gigantamax)
Steel: Metagross, Aegislash, Magnezone, Bisharp, Corviknight, Aggron ( Can Mega Evolve)
Electric: Raichu, Jolteon, Electivire, Luxray, Ampharos, Toxtricty (Can Gigantamax)
Ground: Sandslash, Flygon, Golem, Palossand, Krookodile, Sandaconda (Can Gigantamax)
Bug: Kricketune, Ninjask, Beedrill, Scolipede, Scizor, Butterfree (Can Gigantamax)

I'll work out movesets, but this is my idea so far. What do you think?