If you're interested in trying out Pokémon Ntevo ROMs, you can find them on various ROM hosting websites, such as:
NTEVO patches are available for almost every main-series game up to the Nintendo DS era. Pokemon Ntevo Roms
: For Pokémon that need to be traded while holding an item (like Onix into Steelix), the ROM may allow them to evolve by simply leveling up while holding that item. Quality of Life (QoL) If you're interested in trying out Pokémon Ntevo