Gym Heroes (August 2000) and Gym Challenge (October 2000) are the two sets of this series, with 132 cards each. In both, the catalog count matches the printed set size, so neither checklist has secret rares past the printed number. With only two sets, it is a quick era to work through card by card, and a good place to see how a set checklist and the tick-off flow work before starting on a larger series.
Gym sets by release date
| Set | Released | Numbered cards | Secret rares |
|---|---|---|---|
 Gym Heroes | Aug 2000 | 132 | — |
 Gym Challenge | Oct 2000 | 132 | — |