Hahah This is one crazy card.
Koga's Ditto (Gym C)
Stats are below average. Being a [C] type in unlimited is pretty much useless. An awful weakness (Tyrouge, Hitmonchan, Machop). A decent resistance to [P] and a good retreat cost. What lets this down is it's Hit points.
The only possible use this card has is if you get it out early and do some early damage to your opponent. However this requires a lucky flip on a Giant Growth. If you get a tails, not only do you waste a turn, but Dittos HP stays at an incredible low for an easy KO. Mid game this card is useless anyway (30 damage won't hurt much).
In the early turns you will likely be against a NG Cleffa or a similar Baby, making Giant Growth only 25% of working and then a 50% chance of KOing it. Most good decks tech in a Tyrouge if they don't already have a [F] type, which eats this card alive.
If it does get a lucky Giant Growth, 30 damage will be quite good early but as the game goes on its not as effective. All it requires is 40 damage and then computer search for a Gust of Wind for a Prize. Bench damagers will also be able to scoop easy prizes.
Fun.. But not a very good card.
4/10