Wasn't that movie huge?
Or am I thinking of pokemon 2000?
Ugh, sorry. It was poor performing, but the worst performing Pokemon movie was Pokemon Heroes. Here's the Theatrically released Pokemon movies and what they grossed in the US: http://boxofficemojo.com/search/?q=Pokemon
As a reference, the total monies per theater for each movie...
Heroes: $3731.91
4Ever: $6937.54
3 the Movie: $6374.63
2000: $15900.69
First Movie: $28177.67
Even normalized, Heroes was an epic failure...