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>how hard
decently hard, just don't be a retard and you'll get how Essentials or PSDK works, the real question is
>how long
and the answer is average 5 years.
it's not impossibru because Pokemon starter-kits basically don't require to do much programming lol
only event-making, which is basically as easy as Ardublock/Scratch
just look up how it's done in your free time
t. fangame-maker since 3 years now