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Vega is an interesting one. It's a very well made and polished hack that has a comfy winter region, competent fakemon mixed in some existing mons, and an okay story with good dialogue that actually feels more authentic to me than Brown (main character doesn't speak, no typos or grammar errors, no cringe like that Red Prism Ranger or w/e, etc). The game even makes battles harder by giving the mons of gym leaders and other key trainers excellent coverage and even the occasional strategy (first gym leader's trump card tries to put you to sleep so it can buff itself up for example).
The only problem is the brutal level curve. The gym leaders' godly coverage is fine on paper, but when combined with higher levels for gym mons (3rd gym's trump card is level 30 vs. Lt. Surge's lv. 24 Raichu) and the lousy xp you get from wild pokemon you'll be in for a shitload of grinding.