Can I use Regirock V, etc. to satisfy the requirements for Regigigas' "Ancient Wisdom" Ability?
No, you cannot. Ancient Wisdom is checking for exactly those card names, so Regirock V etc. wouldn't count.
Source: Astral Radiance FAQ; TPCi Rules Team (2022-05-26)

Relevant cards

Note: All applicable cards may not be listed below.
SWSH10_130
SWSH10_130