... Wait, only those three? But...
Scizor: Okay, it got Metal Claw and then can learn Metal Wing via TM. Bug wait, it and Scyther only Bug move is Fury Cutter?! Geez.
Skarmory: Steel Wing of course, though you'd think it could also learn Metal Claw. *shrugs*
Steelix: So, you'd think Steelix would natrually learn Iron Tell then, right? Wrong, it doesn't learn any Steel moves, rather it needs to learn Iron Tail via TM. Infact, no Pokemon naturally learns Iron Tail in Gen II, it's a TM only move. With how often they pair Steelix and Iron Tail together I have to think that was a mistake, it was supposed to learn it naturally but they forgot or something.
Forretress & Magnemite family: I'll pair them together cause they got the same amount of Steel-type moves: ZERO. Like, okay, the Magnemite family probably wouldn't be able to get use of its Steel-type cause it was a Physical Type, still though couldn't even make a Steel-type Tackle or even a Steel-type Explosion/Self-Destruct?
There is a whole batch of words I could describe these decisions (ludicrous, nonsensical, ridiculous); fascinating certainly isn't one of them.