Can I generate ANY TID/SID in Colosseum? in Pokémon Legality Posted July 30, 2020 11 minutes ago, Cass said: I suppose this is a limit of my understanding. I am thinking about TID/SID generation as if it is an RNG where, given enough iterations, 00008/00000 would eventually be produced (even with roughly 4.3bil possibilities). Is it in fact the case that there is only a limited number of TID/SID combinations, and the seed determines which frame those combinations appear? Yes: the seed determines (not which, but) when a given combination will appear; nonetheless, for some games, not every combination is legally possible, no matter how long you wait for its frame. I don't know what is the specific reason for this, however, so if you wish to know about this detail, you would need a person more experienced than me.