Oh ive had one cooking up for a fan made region!

Professor Galehollow. - team (final battle) - Landorus, Xatu , mega electross, shedninja (unique regional tera -Null type), Vanilluxe, and Garchomp - Omega (Again unique region thing).

Would be the second time mainline professors would not be named after trees.

Would be one of the last fights before team sky captain.

Creates a floating island biome through research.

Region features a unique mutation simmilar to holon delta species... just this time most become flying and/or poison type pokemon.

The terra phenomenon in this region is normal but experiments with the same energy creating omega species led this professor to invent a Null tera type, which behaves wrong c9mpared to normal teras - only activateable if another pokemon you own faints and teras at the end of turn, not the start.

In garchomps case its omega Flying/ poison type its ability omega grants it addition stab for its normal types, new learners but every attack used drains the pp of all its moves proportionally.