Medicham is the final form of Meditite, which means it is only the second stage. Meanwhile, Carnivine can not evolve from or into any Pokemon.
The fighting gym, Maylene is the leader. Her Pokemon are machoke, medicham and lucario. Be careful lucario is fighting steel type. machoke-27 medicham-27 lucario-30
Carnivine I believe can be found in the Great Marsh in Pastoria city. Well you go in I believe it is on the second or third or sixth area. I am not sure.
The third pokemon in the pokedex is Venasaur.
The third gym leader is Lt. Surge, an electric Pokemon trainer. In the yellow version his only Pokemon is Raichu. Raichu can be easily defeated by a ground type Pokemon. Conveniently, Diglett's Cave is located right next to the town. In here you can find wild Diglett's and maybe wild Dugtrio's, the evolved form of Diglett. These Pokemon can easily defeat Lt. Surge with the Dig attack.
The third Pokemon game created is Pokemon Blue. It was created as an enhancement of Pokemon Red and Pokemon Green. However in the U.S. and outside of Japan the third Pokemon game is Pokemon Yellow, because Pokemon Green was never released outside of Japan.
Vibrava is a third generation ground and dragon type Pokemon. It cannot be caught in the third generation game but must be evolved from Trapinch. In Diamond and Pearl it can be caught on Route 228, and in Black 2 and White 2 it is found in the wilds of Reversal Mountain.
Ash catches a Pokemon
Train it.
The third pokemon center
'farfetch'd does not evolve' what? the third gym is in mauville. The leader is 'wattson' and he uses electric pokemon.
There is no third evolution yet
There is no Third Island in Pokémon Crystal