In this site, you’ll find some of the Pokémon GSC moves with their compatibilities up to 5th gen! The maner, like level-up or egg move, is not precised, and it’s not that important!
*Note: In the Non TM or Tutor Moves section, I added some Pokémon in some of these moves by logical explanations. “Bonus” contains the Pokémon that I added, and “Justification” contains the justification! If these moves were TMs or tutors moves, I’m sure they could perfectly learn them.
Enjoy my work! 😉
ericgall23
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Sources:
Pokémon GSC Attacks compatibilities 