Well, this repository is a continuous one... While the single frame DS-color sprites and icons for Gen. 7 are already filled with quality sprites, we still have to work with sprites in Sugimori-color and with 2nd frames in the near future (submission for such are still closed)... We also have to wait for le_paragon's polishing of Vivillon sprites, and some placeholder sprites for the missing MEs from MrDollSteak's resource...
As for Gen. 6, we have no jurisdictions over there... Our only scope from previous generations are the ones not covered by any other resources such as the event-exclusives... Though again, we will be posting placeholder sprites for MEs not yet available from MrDollSteak's Gen. 6 resource but only for a limited time (until the ME is available from his thread)...
Anyway, I'll be adding ???-type Arceus this coming week...