What happens if both Corviknight VMAX with "Lustrous Body" and Galarian Weezing with "Neutralizing Gas" are in play? Do they cancel each other out or what?
Lustrous Body takes precedence over Neutralizing Gas. It doesn't matter which one comes into play first.
Source: TPCi Rules Team (2021-04-08)

Relevant cards

Note: All applicable cards may not be listed below.
SWSH5_110
SWSH5_110
SWSH2_113
SWSH2_113