Vermillion City:

New highest lvl Pokemon encountered is lvl40 Spinarak. The Sitrus Berry is obtainable from Headbutt.

 

Mauville City:

Pomeg Berry is obtainable through Headbutt. Sitrus Berry is obtainable through Headbutt. Rare Candy is obtainable through Headbutt.

 

Olivine City:

Duskull can be encountered in the Headbutt trees.

 

Vermillion Graveyard:

Rare Candy can be obtained through Headbutt.

 

Pewter City:

Red Candycanes can be obtained through Headbutt.

Edited November 14, 20187 yr by Joltyena

I found a Phantump in Vermillion Graveyard just now. First time I saw it in the tree so it must be the rarest in there since it require MS to be found in grass.

You forgot to add Rustboro to the new headbutt Halloween spawns.

Vermillion City:

New highest lvl Pokemon encountered is lvl40 Spinarak. The Sitrus Berry is obtainable from Headbutt.

 

Mauville City:

Pomeg Berry is obtainable through Headbutt. Sitrus Berry is obtainable through Headbutt. Rare Candy is obtainable through Headbutt.

 

Olivine City:

Duskull can be encountered in the Headbutt trees.

 

Vermillion Graveyard:

Rare Candy can be obtained through Headbutt.

 

Pewter City:

Red Candycanes can be obtained through Headbutt.

 

Added, thank you !

I found a Phantump in Vermillion Graveyard just now. First time I saw it in the tree so it must be the rarest in there since it require MS to be found in grass.

 

Added, thank you for that !

You forgot to add Rustboro to the new headbutt Halloween spawns.

 

Added, really thank you for that !

Found lvl 41 Phantump in Vermi Headbutts

Drifloon in Rustboro city headbutts

route 7 Trevenant

Found lvl 41 Phantump in Vermi Headbutts

Drifloon in Rustboro city headbutts

Updated the max level encountered in Vermilion City and added Drifloon in Rustboro City, thank you for your help !

 

route 7 Trevenant

Trevenant has always been in my knowledge a Pokémon that can be found in Route 7 by headbutt, however thank you !

Pewter City:

Qualot Berry can be obtained via Headbutt.

 

Cerulean City:

Rare Candy can be obtained via Headbutt.

 

Rustboro City:

New highest level pokemon identified is lvl20 Woobat.

Green Candycanes can be obtained via Headbutt.

Shuppet can be encountered via Headbutt.

 

Mauville City:

Qualot Berry can be obtained via Headbutt.

Edited November 16, 20187 yr by Joltyena

Pewter City:

Qualot Berry can be obtained via Headbutt.

 

Cerulean City:

Rare Candy can be obtained via Headbutt.

 

Rustboro City:

New highest level pokemon identified is lvl20 Woobat.

Green Candycanes can be obtained via Headbutt.

Shuppet can be encountered via Headbutt.

 

Mauville City:

Qualot Berry can be obtained via Headbutt.

 

Added, thank you for the help !