Actually, as there are around 350 fully evolved pokemon (not including the alternate forms of anything), we haven't even hit a third of these pokemon, leaving plenty of possibilities open.There's not many Pokémon left to cover for 5th gen now, and I'm pretty sure it'll end soon for this generation of POTW. So yeah, if you just figure out what's already been done, you'll easily see the few left.
(And as a side note, most of the POTW entries are fully-evolved pokes, so there aren't many left at all.)
transform/ditto's hidden ability can be useful if you know how to use itI still stand by by my decision to combine the Lumineon and Luvdisc PotW's, or at the very least combine Ditto/Unown/Wobbuffet due to either identical movepools or incredibly shallow moves.
This is done in order to conserve efficiency.
like killer draco said, the op states that the process is completely random and won't be voted on. personally, i'd like to see chatot done before pokemon x and y come out, but it's not going to happen unless the random number generator happens to pick it.Can Suicune please be the Pokemon of the Week for the last week of August? Please? Pretty please?