Those someones were wrong. Certification/notarization are only required if the document is translated.
If you do have translated documents, certify them exactly according to the requirements published in CIC's guide. Pay close attention to timeliness requirements. You can find the requirements in the guide by searching under "translation of documents" here:
http://www.cic.gc.ca/english/information/applications/guides/EG7TOC.asp
Quoting from the guide:
Look at the part I bolded. To me, you would need an affidavit from the person at the Indian consulate in Japan who translated your BC. If you don't have this, I think you need another translation so the translator can provide the affidavit. Alternatively, you could provide the translation as is and fulfill all the other requirements, along with a written explanation of why the affidavit is not available, but to me that is riskier as it departs from the stated requirements.
The requirements for certifying true copies are right below the requirements for translation.
Good luck!