>>37900081Grass Knot and Stealth Rock have pretty wide distributions, you could argue why Prinplup, Darmanitan and Plusle learn Grass Knot and Miltank, Jigglypuff and Piplup learn Stealth Rock.
The other two moves are pretty much locked to the attack-type with a few exceptions like a few Steel types learning Volt Switch and a few Bug/Poison/Ghost types learning Giga Drain.
Its like saying lets give Walrein Fire Blast and Dragon Ascent too.
