K so i was looking at Biancamella in the market place was thinking of buying one nut i looked at their items and they all seemed the same and I'm kinda new to EI and stuff so I was wonders whats the difference besides the price??? question
As long as all of the gens are fully evolved there's no real difference. The gens are there to establish order of evolution. The lower the gen, the faster it will finish evolving. The one with no gen is always the first gen, and it will evolve first.
EIs are evolving items, so they evolve. However the first gen tends to do so at a quicker rate so it is worth more if you want an evolution not available on other gens. Eventually they all end up at the same state, the only difference is how rapidly they evolve and usually the value sticks with the first gen.