Code:
Snover:
~Magical Leaf + Skull Bash,
~Double-Edge + Skull Bash + Stomp,
~Growth + Skull Bash + Stomp,
~Leech Seed + Skull Bash + Stomp;
Abomasnow:
~Magical Leaf + Skull Bash,
~Double-Edge + Skull Bash + Stomp,
~Growth + Skull Bash + Stomp,
~Leech Seed + Skull Bash + Stomp;
New HGSS egg move Skull Bash adds Snover and Abomasnow's first illegal combos. Rhyhorn (Stomp) and Bulbasaur (Double-Edge, Growth, Leech Seed) are the viable parents here.
Starting on reserved lists now. These are the remaining Pokemon that learn moves via level-up in the third generation that no longer do so (and effectively act like 3rd gen move tutors) as well as Togepi, whose previous list missed the XD-exclusive move Helping Hand.