Picture this right:
You just beat, say, Leon in Sword and Shield for the first time. Your team evenly comprised of your two favorite types, fire and flying. On the Hall of Fame screen, it announces "Congratulations [Your IGN], the Firestorm Master."
Now you can equip that title and be announced as such throughout the rest of the game, online battles, NPCs with changed dialogue, just going out to shiny hunt, or you can even rematch the champion with a new team for a brand new title.
https://docs.google.com/spreadsheets/d/1cxv_JjMZNUvLLQoKN42mhixtPvtDvo0hIWL24I8RSEI/edit?usp=sharing
I gave a title to every dual type combination. Ideally, if implemented, it would only be obtainable by re-challenging the Elite Four and winning. Dark and Ghost give you Void Master, Bug/Flying: Elytra, Water/Fairy: Siren, and so on.
There should be at least 3 of each type, meaning you could do 6 different Pokemon of 2 different types or only 3 different Pokemon that all share the same dual typing. For example, for fire/flying, a team of Charizard, Talonflame and Moltres would work just as well as, Torkoal, Pidgeot, Infernape, Kilowattrel, Incineroar, and Corviknight, as long as the 3 that share the dual typing are the only ones on your team. (It would not work to have duplicate Pokemon)
Just for fun I added some extra scenarios that would nab you more collectable titles. Some titles are collectable by having three types (at least 2 each). Some require you to have a very specific team, Red's Mt. Silver team, Blue's champion team, etc. Ofc getting all of the dual types will also grant you another new title of Grandmaster (you would not be required to figure out of the extra titles to get this)
Above is the link to the full doc. Feel free to share your thoughts on a concept like this, suggest new titles, change old ones. I don't know how many there are but if someone wants to count them and let me know that'd be cool, I can be convinced to add a few more if it's not a clean number lol.
Edits: Changed Eskimo to Cool
by No_Recording_6287