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The spreadsheet included with the patch (Workbooks/Misc Data.xlsx) says Dartrix evolves into Alolan Decidueye during "day" and Hisuian Decidueye during "night". What isn't explained anywhere, and I believe is the source of everyone's confusion, is what the time frames are for day/night/dusk...
You can buy all the evolution items at the Celadon City Department Store's leftmost entrance. They appear at the bottom of the list.
Possible bug/warning: When you evolve a Pokemon, it doesn't register it to the Pokedex until you go to a Pokemon Center, and if you evolve the same Pokemon twice...
I had that issue happen on my computer after I changed system locale. I have had it happen to other Pokémon fan games, and I noticed that changing locale can screw up Unicode characters.
Through the story
I have had no issues with downloading or playing this game. I believe it is safe.
I am having issues with tilesets not loading when moving between areas, such as moving between Route 1 and Secret Garden, or when entering Viridian Forest. I tried asking for help on the Discord, but I was ignored.
I found a mention of a similar issue on the Wiki that says it could be caused...
Actually, Doduo/Dodrio CAN learn Fly (even though it doesn’t make sense) and Feebas CAN learn Surf (it can learn TM/HMs and egg moves before evolving). All of this works in favor of your argument though.