If I use Umbreon's "Feint Attack" on an opponent's benched Charizard ex, would the damage be blocked by Charizard ex's "Tera" trait or would it go through since "Feint Attack" ignores all effects on the opposing Pokemon?
Tera traits are considered effects on that Pokemon, so Feint Attack would get through it.
Source: TPCi Rules Team (2024-01-04)

Relevant cards

Note: All applicable cards may not be listed below.
SV3_130
SV3_130
SV3_125
SV3_125