I'm trying to build a database of all the secret item skills that
characters can learn. These are skills a character learns only when
they equip a certain item, and then even after you remove that item
from them they still have the skill. These are all the skills I know
so far:

Dragon: learns something when you equip a tree, and one other skill
from something I forget

Secret Classes! (Spoiler)
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Prinny: Prinny Bomb from a Bomb, P Beam from a Skull
Etna: Prinny Raid from a Prinny.

Anyone who knows more secret skills please post here!