You can go to the Safari Zone and add 6 Plains objects and 18 Forest objects on the area Savannah and wait for 20 days. You could use Headbutt on the trees in Viridian Forest.
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Headbutt a tree in the Viridian Forest, you might also get a shroomish.
Shroomish is not available to be caught in the wild in Pokemon FireRed, it must be traded from Ruby or Sapphire.
Shroomish evolves into Breloom, starting at level 23.
Shroomish can be found in the Petalburg Woods in Pokémon Emerald.
Shroomish and Breloom.