I was playing Pokemon TCG with my younger brother a few days ago. He had Ditto (at full HP) with 2 Energy attached to it as his Active Pokemon and I had Scyther with 60 damage on it. I retreat Scyther and I send out Mysterious Fossil. He said that Ditto would stay Ditto and I said that Ditto would become into Mysterious Fossil because Mysterious Fossil counts as a Pokemon card instead of a Trainer card when it is put into play and Ditto's Transform Power copies the Defending Pokemon if Ditto is the Active Pokemon. I was just wondering who would be right, and why?

Thanks, Georgelix