This event was distributed to players at the New York Pokemon Center: Gotta catch 'em all! Station,
and the collection for various PCNY Pokemon ran across the period of November 22, 2001 to March 13, 2003.
The schedule of Pokemon changes weekly, and players was restricted to collecting one Pokemon per week per visit.
The dates for distribution was:
November 22 to 29, 2001
December 7 to 20, 2001
June 22 to 28, 2002
July 5 to 11, 2002
November 15 to 21, 2002
A more comprehensive schedule list can be seen here.
DUE TO HAVING AN EVENT LOCATION,
THIS POKEMON WILL NOT BE LEGAL WITH ANY VIRTUAL CONSOLE RELEASE
(AND BY EXTENSION, CANNOT BE TRANSFERRED TO GEN 7 AND ONWARDS).
Original Thread and Credits to Gold Ursaring!: