Why are moves that the Pokemon can't directly get, but a pre-evo can get due to the mechanic, unavailable for the evolved mons?
If this restriction were relaxed, this could allow for nifty combos, like:
Here, I only covered moves because Abilities can't be passed on through evolution.
Pyro Ball, Wild Charge, Extreme Speed, Play Rough
Shell Smash, Will-O-Wisp
Electro Ball, Eruption
Lumina Crash, Morning Sun
Boomburst
Wave Crash, Triple Dive, Jet Punch
Fell Stinger
Smart Strike
Volt Tackle
Ice Spinner, Wave Crash, Body Press
Salt Cure, Accelerock, Head Smash
Jet Punch
Population Bomb? (could take advantage of Guts for this to work)
Additionally, no pure Normal-types get phazing moves, which would force a quickban for Komala (and/or Comatose).
It was decided to be streamlined similar to that of Inheritance to minimize confusion and potential banworthy elements.