This is quite complex.
In gen 2, the egg moves pass through father and species through mother.
Therefore, we must check that:
1. Two egg moves come from the same father or are learned in another way.
2. If two egg moves come from the same father, check if the father can learn those two as well.
Also, we must keep track of the state of egg and machine moves in the learnset in order to properly reject them when the problem is found.
Related commits: 17e8515486 and 33cc1e09eb
JSHint is now a fair bit stricter, and is now correctly checking
files in `mods/`.
The code has been fixed to match the new stricter standards.
JSHint has now caught its second actual bug: Gen 5 Pinap Berry
was Ice instead of Grass.
