>Gen 5
>Hyped up introduction as an event-only Pokemon and a part of one of the movies
>Gen 6
>Reduced to just another regular wild Pokemon, gets no Mega Evolution, and is promptly forgotten by gen 7
What went wrong?
>>31831236
It just didn't caught on.
>>31831236
Nothing. Gen VIII will have turned Greninja into just another starter. Lucario became just another Pokemon during Gen VII, mega or not. Happens always.
>>31831236
Gen 5
>>31831236
It was event only.
>>31831300
This.
Also GF didn't push it enough.