High atop the tallest tree on Route one, a little egg sit in a nest.

From deep inside hatched a...

Not a Beldum, that's already been done - http://chanarchive(dot)org/4chan/vp/10626/deep-in-viridian-forest-a-little-egg-lay-on-a-leaf-from-de
ep-inside-hatched-a

Not Missingno or Slugma either - http://chanarchive(dot)org/4chan/vp/10695/deep-inside-mt-moon-a-little-egg-lay-in-a-nest-of-rocks-fr
om-deep-inside-hatched-a