Just my 2 cents, but couldn'd Ditto be used for something feeble (ie, Tynamo), then just ''Transform'' into Tynamo T2, and pop out an Eelektrik right away? This way your Tynamo line has a nice 70HP start rather than the weak 30HP basics (before people come wih arguements ''but you could still end up with tynamo'' and such, isn't that always the case?)? Of course I don't know the complete ruling, but seeing it also copies any ''effects'', wouldn't it also transfer the ''already one turn present on the field'' effect to an evolving basic?
In case any of the above is false or just doesn't make sense, I think Ditto is nothing more than a Trolling card, with a mild use of boosting consistency a little in decks that use a small amount of useful pokémon.