just imagine:
>Colosseum mod
>all 386 available (legendaries may be a problem to squeeze in)
>shadow pokemon still available, limited to powerful pokes and pokes with no evolution line because it takes way too fuckin long to purify
>certain areas of the overworld trigger random encounters with wild non-shadows
>going between locations will trigger a random encounter with wild non-shadows, with the encounters and levels changing based on plot progression
>gifted one kanto and hoenn starter each before mid-game