Question

I would try it out on my japanese Munchlax, but I'm really bad at raising happiness.

Comments

Heres tips on raising pokemon:
Battle high pokemon and switch out
use medcines(proteins calciums, etc.)
Use a soothe bell
keep it in your party
See the massage person in castelia city, Etc.

Answer 1

Yes, the Japanese Named Munchlax will evolve into a Japanese named Snorlax.
Hope this helped!
Source:
Personal Experience

Comments

I got a japanese charmander and when i evolved it it was englished named...

Answer 2

Nope. My japanese named Ralts evolved into a Kirlia and it was English named.
GARDEVOIR PWNS.