>>36127557Beheeyem can learn Steel Wing(TM51) because of a programming error. TM51 in Black and White was Ally Switch, a move Beheeyem was intended to learn. When the TM move got replaced, they forgot to make Beheeyem unable to learn it, and boom.
Masquerain can walk on its wings.
If you evolve nincada with an extra slot in your party, you will obtain another pokemon evolved from nincada: shedinja. In its debut, you only needed an extra slot in your party, but from generation 4 onward, the game also requires that you have a poke ball. Any other type of poke ball like an ultra ball won't work.
Tyrogue is the only time a pre-evolution has joined two previously unrelated pokemon together. It is also the only pokemon besides eevee who can evolve into three different pokemon.
