YOU SAID:

Regigigas just can't get going because of its Slow Start.

INTO JAPANESE

レジギガスはスロースタートでなかなか進まない。

BACK INTO ENGLISH

Regigigas got off to a slow start and didn't make much progress.

INTO JAPANESE

レジギガスは出足が遅く、あまり進展がありませんでした。

BACK INTO ENGLISH

Regigigas got off to a slow start and didn't make much progress.