Pokemon Opti-Y

All in all this hack was made by a hardcore Pokémon fan for other hardcore Pokémon fans. If you’re looking for the most technically advanced Yellow hack with the split and repel system and whatnot, this might not be the best for you. But if you want to revisit Yellow with more challenge and fairness, while still keeping the feel old-school, check this out.
Features
    All 151 obtainable
    Stat boosts
    Changed movepools
    23 moves from newer gens
    Increased difficulty
    Up-to-date Type match-ups

Screenshots

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•                                   Click here to download this rom