The MC30 title card Admonition lets you:

"...during the Spend Sefense Tokens step, you may discard a Defense token to cancel one attack die."

So can I exhaust a token, gaining its effects, and then discard that token to cancel a die, all during the same attack?

YES!

(it's the whole point of the title)

I just played a game where my opponent said I couldn't use the same token twice during the same defense tokens step. Therefore, after spending an evade token to red, I had to discard another one to get the Admo effect. Who was wrong here?

Your opponent got it wrong.

Because you're not spending it twice.

Your spending it once.

Then you are discarding it.

NOT the same thing.

The MC30 title card Admonition lets you:

"...during the Spend Sefense Tokens step, you may discard a Defense token to cancel one attack die."

So can I exhaust a token, gaining its effects, and then discard that token to cancel a die, all during the same attack?

YES!

(it's the whole point of the title)

I just played a game where my opponent said I couldn't use the same token twice during the same defense tokens step. Therefore, after spending an evade token to red, I had to discard another one to get the Admo effect. Who was wrong here?

He was.

He's almost got the Rule correct... He has stated it as "you cannot use"... But in reality, the wording is, You cannot spend the same Token Twice.

Admonition is not spending the Token

It is discarding it.

A Subtle, but powerful, difference.

And, because Rules are always better (Bold, italic, underline highlight emphasis mine)

RRG, Page 4, "Defense Tokens":

• The defender cannot spend more than one defense token of each type per attack.

• A defense token cannot be spent more than once during an attack.

• Defense tokens can be spent as part of a cost for upgrade card effects. If spent in this way, a defense token does not produce its normal effect.

and of course:

The Admonition card does not refer, or require, or even ask, you to Spend a Defense Token.

Only to Discard it.

QED.

(Because even philosophers enjoy saying "B****, PLEASE")

Aright. In the end it didn't really change the outcome of the match as we were in round 5 and still had my 2 evade tokens, but still, it's good to know. It makes admo a lot more powerful.

Probably my favorite Rebel title.

Timing wise, say I spend an evade to reroll a double hit on a red, but still get a double hit. Can I then declare admonition to get rid of said double hit, or do I have to declare the spending and the discarding immediately after (thus removing another dice before my opponent rerolls) ??

When an Evade is Declared, it is resolved immediately .

You get to see the result of the Reroll, before deciding on wether to spend other Defense Tokens (or do some shenanigans like Admontion)...

As per the FAQ;

Q: Can a ship spend an evade token to reroll a die and wait to see the result before spending another defense token?

A: Yes.

Remember, nothing has simultaneous timing in Armada... There is always an Order .

The FIRST ORDER you mean?

The FIRST ORDER you mean?

You shut your filthy ***** mouth.