Bellsprout.
krabby
No.
if you have the machine click on it and if there is the word ABLE on it, it can learn it
bellsprouts can learn it or pikachu (EDIT)** my togepi knows it
you need to pick the grass type Pokemon
Yes, Oddish can learn flash.
Shroomish can learn flash.
all the Pokemon on dimmond that can learn flash can still learn flash in the platinum game too
No wurmple can not learn flash
Paris can learn cut and flash
Most of the electric,grass and psychic type can learn flash