ZDoom

It might have failed simply because after resurrection, the resurrected monster copies friendliness of the one that did the resurrection.

Is it really possible to do that? Last time I tried using A_CheckFlag it didn't work for some reason
what I wanted to achieve is to check if the resurrected monster is a friendly monster or not, and if it is it would replace itself with an another monster that has translation (whole monster is blue)

In DECORATE, there's already A_CheckFlag.

In ZScript all you have to do is <pointer>.b<flagname>.

A_JumpIfFlag could be used on actors to read their own flag, so you could constantly change the flag and check it (would be useful to check if the actor is a friendly monster or not)

A_JumpIfFlag("State to jump", "Which flag")
If the given flag is not existing then it would just skip it