>>49493375OP here. I just made an edited ROM of SoulSilver that turns all trade evolutions into item evolutions. Gengar is Spell Tag, Alakazam is Twisted Spoon, Golem is Hard Stone, Machamp is Black Belt, and the others are their respective trade items. I also added Teddiursa to Dark Cave, Phanpy to Route 46, Poliwag and Hoppip to Route 30 and Sneasel to Ice Path like in Crystal.
In the next few weeks I'm going to add back the grass patch to Route 36, remove all the extra story shit HGSS added, revert Ethan and Lyra (Kris) to their old designs, and make Blackthorn City/Route 45 into snow areas.