Choosing the right moves has always been a core part of success in Pokémon, and Pokémon Red & Blue had some astoundingly awful options. Whether they are weak, unintuitive or just impossible to form a strategy with, some moves are better off forgotten or never learned at all. These moves may be one of the best examples of balancing issues in Pokémon's first generation.
Every Pokémon can know up to four moves at a time, and they are the way that Pokémon fight in the games. Every move has an effect, as well as a base power level if it is a damaging move. The better a Pokémon's moves, the more useful it will be in battle. A Pokémon with a good movepool is usually more valuable than a comparable one with a poor movepool for these reasons, and why Pokémon that can't learn TM or HM moves are rarely used apart from Wobbuffet. Because each Pokémon can only have four moves at a time, wasting a move slot with a bad move hurts its viability as a battler.
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Many moves from Red & Blue were perfectly fine in their original incarnation, such as Flamethrower and Ice Beam. However, a few moves would need desperate changes in order to be anywhere close to viable in an actual battle, and some would indeed be changed in future generations. However, few in particular ended up so weak that no Pokémon should ever use them except as an absolute last resort.
There were very few Rock-type moves in Red & Blue, with Rock Throw and Rock Slide being the only two moves in the first generation to have that type, as moves such as Pokémon's infamous arena-trapping Stealth Rock had yet to be invented. Unfortunately, both were fairly weak, but there was a clear hierarchy between the
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