something i see that might be a problem is we currently use the ot to keep track of the number of shinys in the market, who has them, and whether the current owner is a scammer. if this were implemented, there would be no way to tell how many shinys there are in the market (and therefore rarity) and how people got them. with catch by dates and ot changeable as everything else, it becomes infinity easier to scam and sell high value pokemon, and it becomes much harder for shiny traders VD peeps to keep track of the rarity of pokemon.