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If they wanna do something interesting with the types of the new regional forms, they could use these to make a triangle
>Fire/Rock < Water/Fighting < Grass/Flying
>Fire/Rock Typhlosion with rocky armor and spikey stone gauntlets, for Berserker
>Water/Fighting Samurott finally with the right type, as all sword moves are fighting type, for Samurai
>Grass/Flying Decidueye isn't an extinct owl species yet so it keeps it's original typing, for Archer