You can't only in Kanto Region.
Because some of the Pokemon cards/ Pikachu cards won't put that Pichu is the evolved form of Pikachu. The Pokemon cards that have Pikachu on them are mostly old and Pichu wasn't made back in the Kanto or Johto Region. If you have a Raichu card look at the card and you'll see a picture of Pikachu then you'll know what I mean.
You can't get to the johto region in firered.
There are 100 johto Pokemon in all.
Johto
You can't only in Kanto Region.
You cannot find Pikachu in the wild in Johto, however it may be possible to find one in the safari zone. In kanto they are found in Viridian Forrest.
The Pokemon he caught in johto Herracross Chikorita/Bayleef Cyndaquil(then evolves in the sinnoh region) Totodile Noctowl(shiny) Pokemon he already had when he came to johto Pikachu Bulbasaur Charizard(then released) Squirtle(then released) Egg Hatched Phanphy Larvitar Regular Team Pikachu Totodile Chikorita/Bayleef Bulbasaur Cyndaquil Noctowl
Pikachu is not native to the Johto region. If you are playing Soul Silver / Heart Gold / Silver / Gold / Crystal, you must first gain access to the kanto region after defeating the elite four and getting the national dex. You can then meet Pikachu in Viridian Forrest.
Pikachu is found in the yellow forest of region 2. He's in one of the last patches of grass you'll come across when entering.
Johto region!
Pikachu is in every region.
You start out in the Johto Reigon.
There isn't one in johto. its in the kanto region where the safari zone use to be.
You already have the Johto Map once you enter the Johto Region. The Johto map is already at your disposal once you cross over into the Johto region, with all the names of the cities and routes, too. Just travel east of Newbark Town to enter the Johto region, and thus obtain the map.
Because some of the Pokemon cards/ Pikachu cards won't put that Pichu is the evolved form of Pikachu. The Pokemon cards that have Pikachu on them are mostly old and Pichu wasn't made back in the Kanto or Johto Region. If you have a Raichu card look at the card and you'll see a picture of Pikachu then you'll know what I mean.
Johto