Probably evolved from trade with metal Powder, since Ditto has a relation to it in the final version (doubles defense)
It's probably supposed to be based on ferrofluid and how it reacts to magnetism (Goes spiky like Animon appears)
If I were to guess it would be normal/steel, maintain the boosted defense stat, maybe also gain Sp. Def boost too. Basically they wanted to make Ditto able to tank a hit before transforming, but it still didn't really work as the problem is losing a turn more than the stats plus a glaring fire weakness so they scrapped the idea.
