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Adding all of the Gen9 Pokémon will take time. Our modelers/texturers/animators are working as fast as they can, but we can't promise any miracles.
Same for the game mechanics. Updates to stats, move sets, etc. shouldn't take too long, but mechanic changes and especially the addition of all-new game mechanics will take time to implement.
From what I've heard it shouldn't be as much of a leap as from 1.12.2 to 1.16.5, but MC version updates will always be a major step that can't be rushed.