If you beat him in Rocket hideout, go to Saffron City. If you beat him in Silph Co., go to Pokémon Tower, if you beat him at Viridian Gym, go to the Pokémon League.
You follow him to the bridge or Route 24 and battle him.
pickachoo
In the Team Rocket Hideout in Celadon City.
red/blue rhyhorn,dugtrio,nidoking,nidoqueen,rhydon yellow dugtrio,persian,nidoqueen,nidoking,rhydon
He is on cinnibar island. But first, you have to go to the Pokemon mansion and find a key. I don't really remember exactly where it because I am already really far in the game, hope this helps p.s. After beating him you can go to 1,2, and 3 island
In red, you can only catch certain pokemon. In yellow, it's supposed to be a more complete version of red and blue, and in yellow, you encounter Jesse and James from team rocket. In addition, you start off with Pikachu, and later on you get the 3 original starters.
he is in viridian city and also he the leader of team rocket
The Only Way To Get Into The Gym In Viridian City Is You Have To Beat All 7 Of The Other Gym Leaders Along With Beating The Leader Of Team Rocket.....As Long As You Have Strong, High Level Pokemon You Can Beat Him...Hint The Leader Of This Gym Is Also The Leader Of Team Rocket Giovanni.....
Vermillion city (after beating the gym leader)
The President of Saffron City's Silph Co. will give you a Master Ball in Pokémon Yellow after you defeat Giovanni, the Leader of Team Rocket.
in yellow u have to beat team rocket out of biggest town
You get it from a rocket from the rocket hideout in Celadon city.
The boss of team Rocket.
Lemonade
The 7th gym leader in Pokemon yellow is in Cinnebar Island, which is south of Pallet Town. You need a Pokemon with Surf to get there.
pickachoo
There are 8 gym leaders, you have to specify which Gym leader you're talking about. If you beat the 1st one, you have to travel east until you reach a cave called MT. Moon.
You get it as a prize from beating your Rival at Silph Co.