>>44174163Breeding didn't exist in Gen I. All the TMs given out by Gym Leaders in Gen I were one-time uses without any means of acquiring more excluding glitches and cheat devices. While I would agree with you under normal circumstances about rarity, the battle system in Gen I is nowhere near balanced enough for using these TMs to mean anything, so you're left with competitive usage, in which case it's incredibly tedious to acquire again in a community prone to min-maxing.
