With modern printing technology, fake versions are becoming increasingly difficult to detect
All of these are better than retreating to the Bench
Like most Pokmon cards, the value of Dedenne depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Brilliant Stars Trainer Gallery)
There are a ton of cards with very open-ended effects, there are quite a few build-around-mes at a power level that at least looks like it should be enough to allow them to see play in Standard, and the whole set looks and feels a lot like were finally moving back towards synergy-driven gameplay instead of the who can find the biggest threat fest of the last couple of years
Typically this is down to the greater utility of such cards
The key is simply to give it the attention it deserves rather than throwing it together the morning of the tournament