I'm actually not sure about a code, but here's a way of getting mushrooms easily. Go to the Safari Zone and use your safari balls only on Paras and Parasect. (Instead of running around like crazy, just keep turning in grassy areas so you can use up all 30 balls without the time running out.) The two mushroom Pokemon both have a 50% chance of holding a tiny mushroom and 5% chance of holding a big mushroom. Since I assume you want these for the guy who teaches your Pokemon moves that they learned in the past, you only need two small mushrooms or one big mushroom. Hope this helps!
Catch lots of Paras an Parasect.
i found small mushroom in paras and big mushroom in para sect
045496734930
Parasect and paras sometimes give you tinymushrooms when you catch or use the move thief and covet to them.
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You have to catch a Paris to get tiny mushrooms and a parasect to catch big mushrooms
on paras
You could never know that. For little mushrooms, catch a Paras, for they are known to be holding little mushrooms. BYE!
Tiny mushrooms and Big mushrooms are sometimes held by the Pokemon Paras and Parasect both can be found in Area 1 of the safari zone.
he is on 2 island near the game building you need to give him tiny mushrooms or big mushrooms
a paras or parasect might be holding one
i found small mushroom in paras and big mushroom in para sect
Move relearner? On two island near the game corner he wants tiny mushrooms or big mushrooms give it to him to make him reteach moves to your pokemon.
A mere Cameo appearance from Firered and Leafgreen. They do no good, so you may as well sell them.
shiny*
045496734930
Parasect and paras sometimes give you tinymushrooms when you catch or use the move thief and covet to them.