A lot of the attacks aren’t so much “glitched,” but they don’t work the way they were intended to work due to bad programming in RBY. For example, Focus Energy is supposed to raise the critical hit ratio in RBY, which it does do in Stadium and later games, but in RBY it either does nothing at all or prevents the user from ever landing another critical hit, depending on whether the user goes first or second.
Toxic + Leech Seed is an actual glitch, though, because they use the same damage counter. Inflicting both on the same Pokemon will make Leech Seed’s damage increase with Toxic’s, like I said before.
There’s also a REALLY annoying glitch with Rage where, if you use Rage and it ends up missing, the Pokemon will always miss when it keeps attacking with Rage after that. I found that out the hard way when I had my Charmander use Rage on Sabrina’s Abra in Yellow… Abra doesn’t have any attacks so that pretty much rendered the game unbeatable and I had to reset because neither Pokemon could hurt the other.