he is only in the secret room in the HQ
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the groomer in fire red is in pallet town the groomer is gary's sister.
Once you get the powerplant back working, and you can go to Pallet town, you use Surf on the water in Pallet town and go down. There will be some trainers, but when you get to Cinnabar Island, Blue (Gary) will be there. Nothing else will be there though.
in leaf green he is your rival
You use a gary tracker.
Uh..Professor Oak..is... 1. In the introduction of the game.2. The Pokemon Lab in Pallet Town.3. On the PC as a menu option.4. Is in the room where you beat Gary as the champion.