Obviosly, in Japan, the names of Pokemon are different. Though, some of the most popular Pokemon do have the same names. This can make it confusing. So here are some of the names of Pokemon:
Seel-Pawou
Snorlax-Kabigon
Sandshrew-Sand
Squirtle-Zenigame
Wartortle-Camiel
Blastoise- Charmander-Hitokage
Charmeleon-Lizardo
Charizard-Lizardon
Eevee-Euivui
Mew-Myu or Myuu
Pikachu-Pikachu (same)
Butterfree-Butterfree (same)
Oddish-Nazonokusa
Jigglypuff-Purin
Poliwhirl-Nyorzo
Meowth-Nyath
Bulbasaur-Fushigidane
Ivysaur-Fushigisou
Venusaur-Fushigibana
Chansey-Lucky