Doe posted...
Is that intentionally hard coded in or an accident?
Moves in Gen 1 are coded to not be able to inflict status on Pokemon of the same type. Ostensibly, this is so that Electric types can't be paralyzed with Thunder Wave and the like.
Body Slam just happens to be the only move in Gen 1 that can inflict a status not normally tied to its type (edit: and Twinneedle).